Join Shadow Shopper now to see if you qualify to earn extra cash! Sign up is totally free! Once registered, you can opt to get an email every day with all of the jobs they have open, or an email each time a new job opens. I have always thought this would be a lot of fun, so I just signed up!
Turns out this site is garbage. They offer a free membership which is useless. You only get to apply to jobs if you are paying for the premium membership. Sorry for wasting your time on this one.