Amazon is expected to be a good sport and take the loss

In several cases of mine, they just canceled the order. They certainly let FBO resellers flake on "errors". I've bought items that were priced low, bought the entire inventory, then found the order "cancelled" as "out of stock"... only to find the reseller list the exact same item in the same quantity with a new Amazon product number (but the same UPC) at a higher price. I pointed this out to Amazon, who insisted this was fine.