Imyst is a secret shopping company that has a list of assignments on their site. They are also another company that I feel pays a bit better than most companies. There is not always a lot of work on their site, but still there another company to look for work. I have completed asignments for them myself, and I found the work to be very pleasant.
Click on the link below, then click on "Mystery Shoppingr" from the pull down menu at the top.
Click on "Register to be a mystery shopper" from the link in the second paragraph. Follow the app through.
Once approved, assignments can be searched by radius or by state.
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