this question varies way too much from team to team to give an answer at all. Go to www.expedia.com
and get group rates for flights. Paint can range from $40-$70 a case at the events. It's usually a little cheaper than you'd find it at a store.
How much paint you shoot depends on the team/players. I think that the entrance fee is around $600, so assuming you have 6 on the roster, thats around $100/person. Someone else can give you EXACT numbers.
But go to expedia.com. it is much better than priceline or any other site. You should be able to figure everything out there. If you cant, you probably wont be able to get yourself to an event anyway.....