I love Mysteries...

I've been doing Mystery Shops on and off for about 10 years.  For a little bit of time, I've gotten to see free movies, had free meals, and just recently, I got my daughter an eye exam and glasses for ALMOST free.  (They reimbursed me about $120.  Really, not too shabby!),   This was so awesome for us, since we don't have eye care insurance.

Everything is independent contracting work, which means taxes are your responsiblity.  Yeah, I know, it sucks, I hate it, but that's the deal.  Also, be aware that sometimes it takes a month or more to see your reimbursement.  I can't vouch for all Mystery Shop companies, but the ones I've worked for, I get my payment eventually.  Sometimes I have to hound them, but I do get it.

http://beyondhello.com/ is the place that I did the eyeglasses shop for.  Now, you aren't just going to waltz in, buy glasses, and BAM, you got $100!  This is a job, you have make sure you get all the details they ask for and keep good notes...oh, and remember, you are incognito.  Acting!!!