Top-dollars.com offers access to several suvery sites. While some may have concerns about paying for access to their services, they promise a full refund if you are not "absolutely thrilled" with their service.
After finding that the site did not work for me, and believing that the claims they made were greatly exaggerated, I requested the refund. It was stated that refunds had to be requested within two months, and I was well within the deadline. However, every request has been ignored. They would not even send out the promised e-mail confirming that they even acknowledged my request.