Hello,
I wanted to respond to this post originally but just got my account activated today.
There are some good pool rooms in Oklahoma, however, I think you will have a lengthy drive if you want to make it to any of them.
There are 2 good rooms in Tulsa, Magoos and Q-spot. Both of them have weekly tournaments, and Magoo's has been known to host some pretty big tournaments. Q-spot has several 9' Gold Crown Tables, a couple of 8' tables, and some Valley bar boxes. Magoo's is larger, it has a lot of 9' Gold Crowns, and a seperate room full of Diamond 7' Pro-Ams.
You will be in Lawton, so Tulsa might not be an option for you. There is another room in Midwest City called Jamaica Joes. I've never been but I hear it is pretty good.
Hope this helps.