Companies like Gigwalk and Easyshift want your help checking out the competition and all you need is a smartphone. But you do have to work for the money.
Using the app and your phone's camera, the companies want you to snap pictures of specific products and their pricing.
More than 400-thousand people are already making money as secret shoppers. If you want to try it out, make sure you are working with the most reputable sites before you give out any information.