Do you know of anywhere in Oklahoma that buffalo grass sod or plugs can be purchased?
I googled and pretty easily found at least two places selling buffalo grass sod. One in Yukon (5000 sf minimum order because it isn't grown on site) and one in Bixby. I think it's out there, you would just have to find a place close to wherever you are.
Maybe someone who has purchased can chime in with a recommendation. Sorry!
Easton Sod has Cody Buffalo sod. The people at OKC Easton Sod are very helpful and nice to work with.
I'm searching for buffalo also but it sounds like Cody is more for shade than for full sun.
Here is a link that might be useful: Cody Buffalo Sod at Easton Sod in OKC