Coors, MGD, and Icehouse I guess would be decent, cheap brews.
For liquor, I usually go with a bottle of flavored vodka or rum. You can a handle of Burnetts for really cheap, but I dunno, it's not that great. Smirnoff is probably the best of the cheap Vodkas. If it was up to me though, I'd just get a 750ml bottle of Southern Comfort though.