Microsoft have permanently lowered the prices for three Xbox Live Arcade games: Braid, Cloning Clyde and 3 on 3 NHL Arcade.
Braid is now 800 points (was 1200)
Cloning Clyde is now 400 points (was 800)
3 on 3 NHL Arcade is now 400 points (was 800)
Each game also has a demo, in case you're not sure you want to pay even the reduced prices.