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How Do I Plan Stock for an Amazon Deal or Prime Day Without Selling Out or Overstocking?

Amazon deals and big sale events sell out stock or leave piles behind. We build a deal planner that ties each deal to stock, lead times and FBA capacity limits.

Updated 3 min readBy SpiderHunts Technologies

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Quick answer — TL;DR

Deals and big sale events are booked in one part of Seller Central while stock is planned in another, so sellers either sell out mid-deal or send too much. We build a deal planner that records every deal and event, estimates the extra demand using your own past deal results, checks stock, inbound timing and FBA capacity, and warns you when a deal cannot be supported.

Sold out on the first morning

You booked a Lightning Deal on your best-selling air fryer liners for a big sale event. The deal went live at 9am. By 11am, stock was gone, the deal ended early and the listing showed out of stock for the rest of the event, just when traffic was highest. Two weeks later, another deal on a different product sold a fraction of what you sent, and now those units are sitting in FBA heading towards an aged inventory surcharge.

Both outcomes had the same cause. The deal was booked without the stock plan in front of you.

Why deals and stock drift apart

Deals are booked weeks ahead in the deals and promotions part of Seller Central. Stock is planned in a spreadsheet or a restock tool that does not know the deal exists. FBA capacity limits and inbound deadlines for big events are published separately. And the uplift a deal produces depends on the product, the discount and the event, which most sellers keep only in memory.

  • Deals are booked by the marketing side, stock is planned by operations.
  • The restock forecast does not include booked deals.
  • Big events have inbound cut-off dates that stock must meet.
  • Capacity limits may stop you sending extra stock in time.
  • Past deal results are not recorded anywhere useful.

What mismatched planning costs

Selling out during a deal wastes the deal fee and the traffic, and a listing that runs out during a peak event can take a while to regain its position. Overstocking ties up cash and capacity and can end in surcharges or discounting. Sending emergency stock by air to rescue a deal eats the margin the deal was meant to create.

There is also the internal cost of the argument afterwards about who should have known.

For seasonal sellers the stakes are higher. A gift set booked into a pre-Christmas deal has one chance. If stock arrives at the fulfilment centre after the event's inbound cut-off, the deal either runs with too little stock or gets cancelled, and the units that arrive late sell slowly through January at a lower price. The decision that mattered was made in October, when the deal was booked, and it was made without the stock position on screen.

The deal planner we build

  1. A deal calendar holding every deal, coupon and event booking, entered once or read from your promotions data where available, with dates, discount and products.
  2. A record of past deal results per product: sales during the deal compared with a normal day, at a given discount and event type.
  3. An uplift estimate for each booked deal from your own history, adjustable by the person planning it, with a clear note where there is no history.
  4. A stock check that adds the deal demand to your normal forecast and compares it with FBA stock, inbound shipments and stock at your prep centre or warehouse.
  5. Inbound deadlines and capacity limits for each event, so the planner shows whether extra stock can actually get there in time.
  6. Warnings when a deal is likely to sell out early or leave a lot of stock behind, with the options: send more now, reduce the deal quantity, or move the deal.
Planner warningTypical decision
Deal likely to sell out earlySend more stock or lower deal quantity
Stock cannot arrive before event cut-offMove deal or accept limit
Capacity limit blocks extra stockPrioritise which SKUs get space
Deal leaves large stock behindReduce inbound or plan a follow-up promotion
No past deal dataPlan cautiously and record results

Planning a deal afterwards

When someone books a deal, it appears in the planner with a stock warning straight away if the numbers do not work. Operations sees upcoming deals in their stock view without having to ask. Before each big event, one screen shows which deals are covered, which are at risk and which products need stock sent by the inbound deadline.

After the event, the results are recorded against each deal automatically, so next year's planning starts from real history instead of memory.

The planner does not choose your deals. It makes sure the stock side of each deal is decided on purpose.

Are your deals planned like this?

  • A deal has sold out early and left the listing out of stock during an event.
  • Deal stock is sent based on a guess.
  • Marketing books deals without telling the person planning stock.
  • You do not keep a record of how each past deal performed.
  • Event inbound deadlines have caught you out.

FAQ

Frequently asked questions

The questions readers ask us after this guide.

Still have a question?

Ask us directly — a senior engineer will get back to you.

Ask about your project

Can it book deals for us?

No. Deal booking stays in Seller Central with your team. The planner checks the stock side of each deal you book.

How does it estimate demand without history?

It cannot do much without history, and it says so. For new products, it helps you plan cautiously and records results for next time.

Does it include coupons and Prime-exclusive discounts?

Yes, any promotion that changes demand can be added to the calendar with its dates and products.

Does it work with our shipment planner?

Yes. Deal demand can be added to the forecast your shipment planner uses, whether that is one we build or a tool you already have.

Keep reading

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