Place to play airsoft cheap in the Tulsa, Ok area...?

I live in Tulsa, Ok and love airsoft. I used to play in this wooded area in the back of my neighborhood, but it is being removed to add more houses I think. If anybody familiar with the Tulsa area knows of a place I can go to play airsoft preferably legally and preferably for free or cheap I'd really appreciate it. I know of one place, but it is only available like once a month and is way the crap away from where I live so it is kind of inconvenient. Please note that my friends and I aren't professionals or anything. Most of us use Crossman weapons. I loan out a lot of guns during games for people who don't own their own and Crossman provides the best quality airsoft gun for the price, I know that nobody has anything good to say about Crossman, but I have 5 assault rifles and machine guns made by them and they all have lasted well over 3 years of heavy use. Anyway because we don't have the appropriate gear for hardcore matches we would like to avoid those games as much as possible.