http://slickdeals.net/permadeal/12438/Team-Fortress-2-for-PC-17-or-less
"Buy.com has Team Fortress 2 for PC for $17 with free shipping. [Reviews]. New users to Google Checkout can save another $10 and get it for $7."
This is the PC forum so this'll probably fall off the frontpage in a matter of seconds, but if you liked the free weekend or if you want to get in on the awesome TF2 action, $7 is IMPOSSIBLE to argue with. That's SEVEN AMERICAN DOLLARS (I hear those are cheap now) for the retail TF2.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )