It is quite expensive, but if you put the outlay on you just pay for paint at most events. Cheaper too, 2000 rounds (a box of paint) is $80. Compared to casual punter prices it's much cheaper.
Then again, if you use your feminine charms you may find some of the guys who own two gats could loan you one ;)
It all depends on type of gameplay Sakura. I prefer bushball/scenario, the other is supair which is like a basketball game. Fast movement and tactical! Used to play that, may start again in 2012, need to find an amateur team.