The Secret World is on sale for half price, and those of you who have followed the game for a while know that this is a buy-to-play title. Once you've purchased this game, you can play for free forever.
Need a little time to think this over? That's understandable. The sale is running for 48 hours (well, 47 hours as of this writing), so you don't have to decide right now. But if you've been waiting for a chance to get into this modern horror and conspiracy game, $15 isn't a bad price to start in. And the game did just get a secret agent-themed update, if that floats your boat.
[Thanks to Zach for the tip!]