I worked at a Wal-Mart during my freshman year of college. All in all, it wasn't a horrible gig.

The managers are cool about returns, especially when you have a receipt. Excessive returns though (and excessive can vary wildly from store to store and manager to manager) will quickly sour everyone's attitude towards you.

It will work for a bit, but not for too long. Overall, there are probably better ways to do it . . .