Gamer Limit is having a contest for a free copy of Blacklight: Tango Down for XBLA. Easy entry too. Contest ends at 11:59PM Eastern on Friday, July 16th.
http://gamerlimit.com/2010/07/gamer-limit-contest-win-a-copy-of-blacklight-tango-down-for-xbla/
Amazon has the Xbox 360 HD Power Pak (normally $40-70) for $25.
Contents include:
HDMI Cable
Intercooler
TS Charge Base 360
2 NiMh rechargable batteries
via Slickdeals
Just ordered one myself with free 2 day shipping using CAG suggested 3 month Prime trial