I tried and had a look into this about a month ago, and i really did a long search and clicked on many websites that no longer exist. unfortunately there are alot of sites that are closed now. However i have found a few. If you look at my website the are a few under the ptc section. http://www.emoneyspace.com/gavinio70
However there are also some more which work i cannot sign up or register for some reason.
There are also:
And there are also more of the foreign ones as well you just have to look at the sponsors some of the foreign cash browsers and they usually are other cash browsers .
hope this helps.
I currently am on about 12 of these.