The search for cheap beer is a noble one, but spend your time frustratedly driving from store to store, and the money you would've saved will go straight to gas, and, since you're at the station already, 50 Slim Jims. Let the Internet find the deals for you, with ThriftyBeer.
Developed by two indubitably studious Fullerton students, TB's a Gmash-up that'll easily uncover the best price on hops in your hood, saving you both valuable cash, and valuable drinking time. Despite looking like it was an extra in WarGames, the site couldn't be simpler: after bypassing the foolproof "input birthday to prove you're 21" screen, choose your location, and the TB'll spit out matches (and their corresponding Gmap), ranked in a clickable Top 10 of stores, and the 10 cheapest brews at that store, further broken down to quantity (6-pack, 30-pack), price, and price per ounce, determined by the subject that made third grade such a bitch: short division. Since mom & pops can't generally compete price-wise, results're limited to 1500+ locations of the top 10 area chains (Albertsons, Ralphs, Smart&Final, etc), and're arrived at via proprietary methods that include grilling both owners and distributors, with results updated about once a day, or approximately half as much as you actually need them.
Soon, Thrifty'll also be breaking things down by zip code and beer type, and'll also eventually be starting a similar site for liquor -- because while the search for cheap beer is a noble one, the search for cheap banana vodka can wait a little bit.