The Steam sale is going on right now and Portal 2 is half-off! http://store.steampowered.com/app/620/
A copy of Portal 2 costs $25. But -- there is a 2-pack available for $45, which makes it $22.50 per copy. Granted, not an amazing savings over just getting one copy, but I can't say not to an opportunity to use Bitcoin and help another Bitcoiner save a little bit of money. Plus, it could be substantially cheaper for someone who lives in another country.
So here's the deal -- I will either buy or
sell a copy of Portal 2 at the median of the ask/bid exchange rate on MtGox * $22.50. Right now it's trading for 14.4 BTC/USD, so that'd be 1.5625 BTC. If you would prefer to spend Bitcoins, I'll buy the game on my credit card, you send me 1.5625 BTC, and I'll send you a copy of the game. If you would prefer to receive Bitcoins, you buy the same through Steam, send the second copy to my Steam account, and I'll send you the Bitcoins. Whoever has the lower rep sends the goods first.
Note that this sale only runs for the next 23 hours, so if you want it, let me know immediately!