It's less than you think, I was a supervisor at Fry's right after I left college and believe me the buyers for the company bitch and the store management just as much when they have to give out rainchecks as you are bitching now. One of the big problems is the cashiers in the store, basically you have this mouse on sale for 99 cents or whatever item that's a great price, some local computer store owner will come in and attempt to buy like 100 of them the minute the store doors open. Cashiers and front management are supposed to know to stop them but a lot of times they don't and then there goes all of your stock before regular customers who want to buy just 1 can get in there.