Finding a product with great ROI can be exciting. But great ROI on a spreadsheet doesn’t necessarily mean it’s a great product to buy.

One of the biggest differences between experienced Amazon sellers and everyone else is knowing when to walk away. Sometimes the smartest sourcing decision you can make is a simple one.

Don’t buy it.

Here are four warning signs that should make you take a closer look before placing that order.

There are too many sellers

More sellers usually means more competition. If 25 sellers are fighting over a product that only sells 100 units per month, those sales have to be divided among everyone competing for the Buy Box. And there’s another problem.

More sellers can mean more opportunities for someone to lower the price. One seller drops by a dollar. Another follows. Then another. Suddenly, the ROI that made the product look attractive when you purchased it may be gone by the time your inventory reaches Amazon.

Amazon is in stock

There’s a competitor every Amazon seller should pay particularly close attention to: Amazon itself.

When Amazon is consistently in stock and competing on a listing, it can make the opportunity significantly less attractive for third-party sellers. Amazon may capture a substantial share of sales, compete aggressively for the Buy Box, and replenish inventory faster than other sellers. That’s very different from a listing where Amazon’s inventory is disappearing.

If Amazon has plenty of stock available, ask yourself: why do I want to compete with Amazon for this sale? Sometimes there’s a good answer. Sometimes there isn’t.

Days of Cover is high

This is one of the biggest signals we watch at Ripe Banana. Days of Cover estimates how long the inventory currently available on Amazon could last, based on the product’s estimated sales velocity.

The same product, two very different markets

Days of Cover = units available on the marketplace ÷ estimated units sold per day

Estimated sales
10 units / day
Available inventory — crowded
500 units → 50 days of cover
Available inventory — tight
100 units → 10 days of cover

At 50 days of cover there is plenty of supply to satisfy current demand. At 10, the market looks very different.

High Days of Cover can mean you’re buying into a crowded market with plenty of inventory already waiting to be sold. Unless demand suddenly increases, all of that inventory needs to move before meaningful scarcity can develop.

Beware of artificial shortages

Low inventory can be exciting. But it can also be misleading. Imagine Amazon normally carries thousands of units of a particular product but temporarily goes out of stock. Third-party inventory starts disappearing. Seller count falls. Days of Cover drops. Everything looks like it’s pointing toward scarcity. Then Amazon receives a massive restock, and the “opportunity” disappears.

That’s why you shouldn’t look at a single snapshot of inventory and assume you’ve found a winner. Look at the history:

  • Is inventory consistently declining, or only today?
  • Does Amazon regularly go out of stock on this listing?
  • How quickly does Amazon typically replenish?
  • Is seller count actually trending downward?
  • Is the shortage sustained, or just a temporary blip?

Real scarcity and temporary scarcity are two very different things.

Don’t let ROI fool you

This is where many sourcing decisions go wrong. You see 100% ROI. Great. But what happens if there are 30 competing sellers? What if Amazon has 2,000 units available? What if there are 75 Days of Cover? What if the apparent shortage disappears tomorrow?

How Ripe Banana helps you know when to wait

Ripe Banana looks beyond today’s selling price to help you understand the inventory conditions surrounding a product. Our ripeness scale makes that information easier to act on.

Ripe

Ripe — opportunity

The combination of profitability and inventory conditions meets your selected buying criteria.

Ripening

Ripening — watch

Interesting, but not quite there yet. Keep monitoring the product as inventory, competition and profitability change.

Rotten

Rotten — pass for now

The numbers don’t currently support the opportunity you’re looking for.

That last category is important. A rotten banana doesn’t mean never buy this product. It means don’t buy this product under these conditions — and conditions are exactly what change.

Amazon sells out. Competitors disappear. Inventory declines. Days of Cover falls. Prices move. Today’s pass could become next month’s opportunity.

Sometimes the best buy is no buy

Successful Amazon sourcing isn’t about finding a reason to say yes to every product. It’s about having enough information to confidently say no.

Too many sellers? Amazon sitting on a mountain of inventory? High Days of Cover? A shortage that looks suspiciously temporary? Wait. Keep watching. Let someone else take the risk.

The goal isn’t to buy more inventory. It’s to buy the right inventory at the right time.