I went last year and it is really good fun. We stayed in Cordoba city and took the bus to Villa Belgrano - from what I remember it was really cheap (the bus, that is).
The actual beerfest isn't so cheap. It cost us ARG$70 for the entry, then something like ARG$50 for a mug (which you get to keep forever and ever, or until it breaks on the way home). The mug then gets refilled TWICE for free, then you need to start paying. Depending on the size of the mug, the drinks can be pretty damn expensive - we were looking at at least ARG$30 each one, so drink slowly. I would imagine that this year it will be more expensive.
The atmosphere is great though, and the town is really nice with people from all over Argentina and the world. I can't remember any stand out drinks, but just sample everything local and you can't go wrong.
I hope you get better weather than I did, and if you are taking the bus back to town, don't forget to use the loo BEFORE you leave or else your back teeth will be swimming by the time you get back.
Enjoy.