If you guys use 500 paintballs in 4 hours, I'll shit. At the pace of play I anticipate, there will be a few games you wont even get shot off before you're toast. But if you wish, you can buy 500 paintballs in a case for $25.00 a pop. So bring money accordingly.
PS, Did I mention you may be playing with 5-6 SWAT trained Police Officers...
Just a heads up.