Cost of goods is usually the largest controllable cost in the business, and the one least often revisited. Most sellers negotiate once, at launch, and never again.
Savings of 10–30% with no change to quality are common for sellers who simply ask properly. On a product where COGS is a quarter of the selling price, a 10% reduction is 2.5 points of margin — £62,500 a year on £2.5M of revenue, with no extra spend and no new risk.
Prefer to watch? One hundred and twenty-three seconds on why you need a number before you open, the four reasons that serve your supplier's interests, and why lower COGS raises your advertising ceiling.
When to renegotiate
If it has been more than about ten months, now.
Your volumes have grown. Material costs have moved. Your supplier has other customers who ask annually and get better terms than you do. Nothing about your current price reflects your current relationship.
Find out what the price should be first
Do not open a negotiation without a number. "Can you do better?" invites a token 3% and closes the subject for another year.
Get quotes for the same specification from other suppliers or trading agents. You are not necessarily going to switch — you are establishing what the product actually costs to make at your volume.
That number changes the conversation entirely. You move from asking a favour to presenting a market rate.
Set the conversation up properly
Ask for fifteen minutes. A short scheduled call, not an email thread. Email invites a written refusal; a conversation invites a negotiation.
Open by confirming the relationship. Say you are happy with their work and intend to keep working with them long term. That is not a pleasantry — it removes the fear that this is a prelude to leaving, and a supplier who thinks they are losing you negotiates worse, not better.
The four reasons that work
Give them reasons that serve their interests, not yours.
1. Lower costs mean more marketing, which means more orders. The most persuasive argument available, because it is true and it benefits them directly. A cheaper unit lets you advertise harder, which increases volume, which is their revenue.
2. The market got more competitive. Advertising costs have risen and margins have compressed. Holding your position now costs more than it did, and the supplier's price has not moved to reflect it.
3. Give them a twelve-month volume forecast. Concrete numbers, not "we hope to grow". A supplier prices against expected volume, and a credible forecast is the single most reliable route to a better rate.
4. Your business is growing and investing. You are putting money into people and marketing, which is tightening margin while building the volume they benefit from.
Then make a specific ask: match or improve on the price you have been quoted elsewhere. Not "what can you do" — a number.
The levers beyond price
If the unit price will not move far, the cost still can.
Materials — an alternative that performs the same. Ask what they would suggest; they know which inputs drive the price.
Less material — thinner walls, lighter components, less packaging, where quality is unaffected.
Simpler packaging — often a meaningful share of unit cost and almost never scrutinised.
Configuration — 100-count to 90-count, or a different pack size. This changes your cost and your FBA fee at once, and customers frequently do not notice.
Volume commitment — committing to a schedule rather than ordering ad hoc is worth real money to a factory's planning.
Consolidation — if you use several factories, moving volume to one buys leverage.
And check the freight side while you are there. Container utilisation and shipment consolidation are pure arithmetic, and a half-empty container is a cost you are choosing.
A caution on switching
A cheaper supplier who cannot hold quality is not cheaper. A rating drop costs conversion, rank and advertising efficiency — see Why a Rating Drop Costs More Than It Looks.
Use competing quotes to negotiate before you use them to switch. Your existing supplier already knows your product, your tolerances and your packaging. That is worth something real.
If you do switch, sample properly and expect two or three rounds before production — the same discipline as Designing the Offer.
After a win
Update your sourcing cost with Amazon. Reimbursements are calculated from it, and a stale figure quietly costs you on every claim — see Reimbursements, COGS and FBA Capacity.
Recalculate your break-even ACoS. Lower COGS means you can profitably tolerate a higher ACoS, which means more advertising and more volume than before — see Scaling Profit Campaigns.
That second point is the one people miss. A margin improvement is not just profit banked; it raises the ceiling on what you can afford to spend to grow.
Then diarise the next review for ten to twelve months out.
Common mistakes
Negotiating without competing quotes.
Opening by email rather than on a call.
Asking vaguely instead of naming a number.
Leading with your problems rather than their benefit.
Switching for a small saving and inheriting a quality problem.
Not updating sourcing cost afterwards.
Not recalculating break-even, and leaving the growth on the table.
Related
- Where Your Margin Actually Goes — the five levers, sized.
- Reducing FBA and Referral Fees — the fee side of the same job.
- Reimbursements, COGS and FBA Capacity — what to update afterwards.
- The Supplier Cost Breakdown Sheet — the document that gives you something to negotiate with.