[Trick] FBA 999 Cart Method

Estimating product demand is in my opinion the most valuable thing to do when doing product research. You always want to have an idea if a potential niche has enough demand or how you many units your competitors are selling. For this we use tools like Jungle Scout.

However, during my Jungle Scout Review we discovered that Jungle Scout is not that accurate on low volume products.

Jungle Scout Accuracy Test

 Actual SalesJungle Scout EstimateJungle Scout Accuracy
Product 1 (High Demand)48346997%
Product 2 (Medium Demand)22120894%
Product 3 (Low Demand)13512190%

Here we have our test results from the JS review again where you can see that the tool is very accurate medium to high volume products. But not that accurate on low volume products.

Luckily we can use another trick that is 100% accurate! It’s called the

999 Trick

And it’s actually really simple:

  • 999 units is the maximum you can order on Amazon.
  • When placing more units in your shopping cart than the seller has in FBA inventory, Amazon will tell you exactly how much units that seller has.

So you can get an inventory count on a product today. Then do the exact same thing 1 week later and you will get an idea of how many units this product is seller per week!

Does this always work?

No! There are a couple of times this method doesn’t work:

  • Seller has more than 999 units.
  • Seller has a max order limit per customer.

Automate it!

If you are a regular visitor of this blog you know I’m rather lazy, and I like the work as efficient as possible. You can imagine how much time it will take if you want to keep track of the inventory of +10 products. Luckily for me Sellics has automated this feature:

For each day it will do the 999 trick for the products you like to track. Then it will show you this overview where you can see exactly how the inventory levels changed for a particular product.


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  1. Hello, if i want to use the 999 trick to track the sales of a product in Spain, but the seller sells it in all europe, the results will be for all europe because he has only one inventary in one of the european countries. Am i right ?

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