You can normally find beta key giveaways or sweepstakes, along with other free things here! http://www.curse.com/giveaways
thats a nice one i usually also keep track on http://eu.alienwarearena.com/giveaways or http://na.alienwarearena.com/giveaways be sure to check both because sometimes there are different giveaways, while eligable for global.
