I believe that most of the demigods players who have wanted to be in the Ready to Play beta have got a key themselves already. However if there are people out there who hasn't got a key but still wants one you can just write here in this thread. I have 5 keys to give away myself and I am sure that there are other people who have keys over as well.
For those who don't know what RtP is, check this thread: http://forums.demigodthegame.com/363215
Just say "I need a key" and I will PM one for you.