C.W.
I have done mystery shopping in the past. I was told by a mystery shopping company not to pay anything to a mystery shopping company to get into the field. ( This was the company that I currently doing mystery shopping for).
When I first started it, I did join a company and pay $10 a month, I never got any shops, so I never worked. I would recommend that you not pay money for a company to send you leads for shops. To me, it seems like it is rip-off and they are taking your money to do something that they should be giving you leads anyway.
I work with DSG and they no fees to get started. You sign some contracts saying you are an independent contractor. Sometimes they send me emails asking if I want to do a shop, however most of the time I call and find out what is available and set up my own times when I want to work.
It is something that you won't make a huge amount of money. I made a little, the more you work, the more you will make. Most shops you get paid are $7-10. They do have some insurance shops that you can call over the phone and get a quote and that doesn't cost as much, since it is the phone call you are paying for. There is a lot of paperwork and you don't get paid till they receive the paperwork and go over it. It is usually a month or so till I get paid. If you want DSG information, I can give it to you. Good Luck