I tried this once, and made a little money, but just haven’t done anything in a while. You can make some money, if you live in a place that offers lots of opportunities, or if you are willing to drive some distances. I happen to live in a smaller city, and there are just not that many opportunities. Also, the companies don’t want you to mystery shop in the same store very often, so again, I don’t have a lot of chances to make money. But if you live in a metro area, I’ll bet you could do really well with mystery shopping.