PC, that line is just one of so many great ones from KFM....a must see for a lot of the kids on this board.
My personal experience is that going to a super mercado in Mexico (HEB, Gigante, etc) is the best way to get cheap beer and liquor....no haggling, no wondering if you just got ripped off because you don't speak perfect spanglish and you didn't feel like price checking at 5 different stores.