I need help planning out a trip?

So me and 2 friends wanna go see some bands in san antonio texas on july 21, 2011. We are from el paso texas. I need help planning out this trip to use up as little money as possible. Can someone help me find a cheap deal on a flight or bus?(Whichever is cheaper), I know we can probably get a cheap room, probably eat dollar menu and use taxis to get around, we want to leave july 20th and come back the 22nd can anyone help me plan out budget probably between 100-250, I know tickets are probably 50 with tax and shipping our ages are 19, 18, and 17