Alright, I can't just sit by anymore and not put my two cents worth in here.
Many people feel that ShadowShopper is the answer to one's mystery shopping prayers. Personally (and there are just as many or more people who agree), I TOTALLY DISAGREE with ShadowShopper's "automatic renewal" policies. They "lure" you in with their offer of a "free" one week or one month "trial" offer and then "automatically" charge your credit card (unless you cancel in time) for a "renewal" at the REGULAR amount. You can accomplish the same thing for FREE by registering yourself with the various Mystery Shopping Companies. They have a good list here, at volition.com, at walletboosters.com and on the MSPA site at mysteryshop.org (among other places) and they're all free.
There are some 500 or so companies, so it may seem like an "insurmountable" task to register with even a hundred of them. But, if you just dedicate yourself to registering with just 3-5 companies per day, after your first month, you'll be registered with nearly that...and registration can, and should, be an "on-going" thing until your so busy that you don't want to get more offers.
ShadowShopper is NOT a Mystery Shopping Company, but, rather, a "brokerage house" that notifies you of available shops...where do you think these job notifications come from if not the various Mystery Shopping Companies that you can register with directly. ShadowShopper's free "Bronze" level membership still allows you access to all of their training materials and information and the training material is, (I think) their best use.