Amazon Warehouse is a special place where you can pick up bargains on everything including best sellers.
It's the tucked away part of the website that sells returned, warehouse-damaged, used or refurbished products.
Things that Amazon can't classify as "new" but should be in perfectly working order.
Sometimes all it means is that the box is open.
You can pretty much get everything that you can in the normal Amazon, or at least there's stuff for every kind of category: books, beauty, toys, grocerys, electronics, TVs, video games and more.
When you choose a category, just make sure you look at the prices from low > high (Amazon puts the default as 'featured').