Hiya,
I have just been doing some flying at a school in Tulsa Oklahoma at Riverside Airfield. I would recommend them without hesitation and they have very reasonable prices and you don't have to pay all up front either as with some of the other schools I looked at.
Aircraft availability has been great, and the planes are well looked after. No hidden extras and no need for a visa unless you are doing the CPL course here. They have a Duchess, a 172 and a couple of 152's.
If you want any details pm me.
Best of luck.