No mate, you can get free power tookens, or at least in theory. You should try one of theese. Now, I can't guarantee on the number of surveys that will work for you, but I've heard people that got tokens out of it, so why not give it a try.
If you go onto the store, and go onto the Powertokens section of it, underneath the choice of how many tokens you want to buy, then there should be a section about doings surveys etc. for tokens, most of which are free. If you signed up through Miniclip however, then this option will most likely not be there.