I have a better idea.
buy cold beer at the store, then take it home and keep it in your fridge. that way when you're ready to drink it, it's already cold.
In Oklahoma, the only cold beer that can be purchased is the 3.2 pee water; otherwise, it's all sold warm.
See my earlier post about an ice chest, ice, and rock salt. It's the best way to speed chill beer.