I've done mystery shopping many times, most of the time with kids in tow, though not lately. I found most of the companies at www.volition.com -- if you find mystery shopping there will be a list of companies. It should always be free to sign up with them -- I would stear clear of anyone who charges for those leads. It was a little time consuming to sign up with all of them (there is a lot!) but once you do, you will start getting emails with different jobs that you are eligible for. If the shop interests you and you are able to meet their deadlines, etc. you can request it or sign up for it. Each company works a little differently - some give cash, some give meals or merchandise depending on the shop. Definitely fun and I am sure people can make some $$ doing it -- I didn't do it more than once or twice per month due to time constraints. Good luck!