Do you have your tickets yet? Microsoft and Best Buy are offering a code for two free Watchmen tickets if you buy any of various Xbox 360 doo-dads. The cheapest way to get the code is by purchasing a card for one-month of Xbox Live for $7.99. But since any XBox Live user worth his salt is on an annual plan, buying a month isn't going to do you much good. So click here to order a $20 card for 1600 Microsoft points good for Rock Band songs, next week's South Central expansion for Midnight Club LA, a copy of Braid, or anything else available from Xbox Live Marketplace.
(Thanks Slickdeals via Canadian Paul!)