Once you have your estimate, resist the urge to buy big. Start with a conservative order—cover about 70% of your projected monthly demand. Then set a restock trigger: when you're down to two weeks of stock for a fast mover, order more.

This approach limits your risk. If a product doesn't sell, you're not stuck with 200 units. You can also test new products in small batches. For example, if you're considering a new device like the VERTEX-25K, order a sample quantity first and see how your customers react before committing to a full case.