For me this is kind of personal info. If we meet in person ill tell, but on the forum I can tell you how much you can expect to spend.
The weekend at the RIO with the evo discount = ~$530
Food is expensive if you don't do fast. For the weekend at a sit downs restaurants if you do lunch and dinner = $160 to $240
Gas to drive to las vegas both ways from ATX = $250
Plane tickets cost min ~$200
So min very rough estimate is ~$890 if you go by your self and have your own room. Now of course you can decrease the price by staying with people, bring your own food and just microwaving it, not staying at the rio, and driving with buddies who will split the gas. The trip doesn't have to cost a lot but you won't enjoy your self as much.
If anybody see any mistakes correct me.