Amazon Supply Chain Management: Reducing Costs Without Sacrificing Speed

Supply Chain Is Where Margins Are Made (or Lost)

Most Amazon sellers obsess over PPC strategy and listing optimization. And they should. But the sellers who build truly profitable businesses are the ones who get their supply chain right. Because you can have the best advertising in the world, and if your logistics are eating your margins, you're just scaling a money-losing operation faster.

Insights from Andrew Morgans and the Marknology team in Kansas City.

At Marknology, we don't just manage Amazon accounts. We operate our own warehouse and help brands optimize their entire supply chain from manufacturer to customer's door. This guide covers the strategies that actually move the needle.

FBA vs. FBM: Making the Right Choice

The first big decision: do you let Amazon handle fulfillment (FBA) or do it yourself (FBM)?

Fulfillment by Amazon (FBA)

You ship inventory to Amazon's warehouses. They store, pick, pack, and ship orders. They also handle returns and customer service for those orders.

Advantages:

• Prime badge (massive conversion rate advantage)
• Amazon handles customer service and returns
• Multi-channel fulfillment available
• Better organic ranking (Amazon favors FBA listings)
• Scalable without hiring warehouse staff

Disadvantages: Learn more in our marketplace expansion strategies.

• FBA fees add up (fulfillment + storage + potential long-term storage surcharges)
• Limited control over packaging and unboxing experience
• Commingling risk if using stickerless inventory
• Inventory limits (especially for newer sellers)
• Difficult to manage during peak season capacity constraints

Fulfillment by Merchant (FBM)

You store and ship orders directly from your own warehouse or 3PL. You handle (or outsource) customer service and returns.

Advantages:

• More control over packaging and branding
• No Amazon storage fees
• Better for large, heavy, or slow-moving products
• More flexibility with inventory management
• Can be cheaper for certain product types

Disadvantages:

• No Prime badge (unless using Seller Fulfilled Prime, which has strict requirements)
• Lower conversion rates compared to FBA listings
• You're responsible for shipping speed and reliability
• Customer service burden falls on you
• Harder to scale without infrastructure investment

The Hybrid Approach

The smartest sellers use both. Send your top-selling, fast-moving products to FBA for the Prime advantage. Use FBM (or a 3PL) for slower-moving SKUs, oversized items, or as backup inventory when FBA limits are tight.

The 3PL Advantage

Third-party logistics providers (3PLs) sit between doing everything yourself and relying entirely on Amazon. A good 3PL can dramatically reduce your costs while maintaining (or improving) your speed.

What a 3PL Does

• Receives inventory from your manufacturer
• Stores products in their warehouse
• Preps and ships FBA inventory to Amazon's warehouses
• Fulfills FBM and DTC orders
• Handles returns processing
• Provides inventory management and reporting

Why Use a 3PL Instead of Just FBA

• Lower storage costs: Amazon's storage fees (especially during Q4) can be 3-5x higher than 3PL warehouse rates
• Better inventory flexibility: No FBA quantity limits or restock restrictions
• Faster FBA replenishment: A domestic 3PL can send inventory to Amazon in days vs. weeks from overseas
• Multi-channel fulfillment: Ship to Amazon, Shopify, TikTok Shop, and wholesale from one location
• Prep services: Labeling, bundling, poly bagging, inspection, all handled before inventory reaches Amazon

Choosing the Right 3PL

Not all 3PLs are created equal. Look for:

• Experience with Amazon FBA prep requirements
• Location near Amazon fulfillment centers (reduces shipping time and cost)
• Transparent pricing (no hidden fees)
• Technology integration (inventory management software, real-time reporting)
• Scalability (can they handle your growth?)

Cost Optimization Strategies

Here's where the real money is saved. These strategies can reduce your total supply chain costs by 15-30%. Learn more in our our warehouse and fulfillment.

1. Right-Size Your Packaging

Amazon's FBA fees are based on product size and weight. Every extra inch of packaging costs you money on every single order. Audit your packaging dimensions and find the smallest box or poly bag that safely protects your product. The difference between "Small Standard" and "Large Standard" tier can be $2-3 per unit.

2. Optimize Your Inventory Levels

Too much inventory at Amazon means paying excessive storage fees. Too little means stockouts that kill your ranking. The sweet spot: 4-8 weeks of inventory at FBA, with backup stock at your 3PL ready to replenish.

Use Amazon's Inventory Performance Index (IPI) and restock recommendations as a starting point, but don't rely on them blindly. Layer in your own demand forecasting based on seasonal trends, promotional plans, and historical data.

3. Consolidate Shipments

Sending multiple small shipments to FBA costs more than consolidated larger shipments. Plan your replenishments to maximize case quantities and reduce per-unit inbound shipping costs. If you're using a 3PL, they can batch shipments efficiently.

4. Manage Long-Term Storage Proactively

Amazon charges long-term storage fees on inventory sitting in their warehouses for 181+ days (and surcharges at 271+ and 365+ days). Monitor your aging inventory weekly. Options for slow-moving stock:

• Create removal orders before surcharges hit
• Run promotions or Lightning Deals to move aging inventory
• Adjust pricing to increase sell-through rate
• Return to 3PL warehouse for off-Amazon storage

5. Negotiate Manufacturing Costs

This is upstream, but it's part of your supply chain. As your volume grows, renegotiate pricing with your manufacturer. Even a 5% reduction in COGS (Cost of Goods Sold) can add up to tens of thousands in annual savings. Consider:

• Larger order quantities for volume discounts
• Payment term negotiations (longer terms improve cash flow)
• Multiple supplier quotes to maintain competitive pricing
• Quality audits to reduce defect rates and returns

6. Optimize Inbound Shipping

If you're importing products, shipping costs are one of your biggest expenses. Strategies to reduce them:

• Ship ocean freight instead of air whenever lead times allow
• Consolidate shipments with other brands using the same freight forwarder
• Use Amazon's Partnered Carrier program for domestic FBA shipments
• Compare rates across multiple freight forwarders quarterly

7. Reduce Returns

Every return costs you: the refund, the fulfillment fee (Amazon doesn't refund this fully), the lost product (damaged returns can't be resold), and the impact on your metrics. Reduce returns by:

• Improving listing accuracy (set correct expectations)
• Adding sizing guides, compatibility information, and detailed specs
• Improving packaging to prevent shipping damage
• Responding to customer questions quickly
• Fixing recurring product issues identified in return reasons

Seasonal Planning: Don't Get Caught Off Guard

Amazon's supply chain constraints during Q4 (October through December) catch sellers every year. Plan ahead:

The pressure of managing Amazon advertising without the stress is real. Drew Morgans dives into it on Business Therapy -- honest conversations about the challenges sellers actually face.

See how Marknology helps brands grow on Amazon in our brand overview video.

Q4 Timeline

• August: Finalize Q4 inventory quantities and begin shipping to 3PL or FBA
• September: All Q4 inventory should be in transit or at Amazon. FBA capacity limits often tighten in October.
• October: Prime Big Deal Days. Monitor sell-through rates and adjust restock plans.
• November: Black Friday and Cyber Monday. Ensure backup inventory is accessible for emergency replenishment.
• December: Monitor daily. Post-Christmas, start planning inventory drawdown to avoid January storage fee increases.

Year-Round Planning

Don't just plan for Q4. Create a 12-month inventory calendar that accounts for:

• Seasonal demand fluctuations in your category
• Planned promotions and launches
• Manufacturing lead times
• Shipping transit times (especially international)
• Amazon capacity limits and restrictions

The Marknology Warehouse Advantage

This is where we're different from most Amazon agencies. We operate our own warehouse, which means we can offer our clients:

• Integrated 3PL services with Amazon account management
• FBA prep and shipment from a single partner
• Multi-channel fulfillment (Amazon, Shopify, TikTok Shop, wholesale)
• Real-time inventory visibility across all channels
• Faster response times because your account manager and your warehouse manager are on the same team

Having your agency and your 3PL as one partner eliminates the communication gaps that cost brands money. When we see inventory running low, we don't email your separate 3PL and wait for a response. We walk to the warehouse and fix it. Learn more about our supply chain management capabilities.

The Bottom Line

Supply chain optimization isn't glamorous. It doesn't have the immediate dopamine hit of watching a PPC campaign drive sales. But it's where the most profitable Amazon brands separate themselves from everyone else. Every dollar saved in logistics drops straight to your bottom line.

Want Help Optimizing Your Amazon Supply Chain?

From FBA prep to full 3PL services, we help brands reduce costs and ship faster. Talk to our team and let's find the savings hiding in your supply chain.