If you don't already have it, you should go and pick up a program called "Raptr
". It has a bunch of cool stuff, most notably its reward system. Raptr will receive reward promotions from different games, including free-to-play MMOs, that you can get access to by simply playing the respective game.
Well, Rift is going free-to-play on the 12th of this month (June). Go and download the Lite version, play it, and you can earn a free full-version copy of the game, among other goodies, from the Raptr rewards system. Good luck.