You can get some from Texas Tripe. He comes to OKC area about once a month. You could also try Mann's Best Friend on 104th and S. Penn. Really nice store with nice owners.
Rusti EAC, TN-N, TG-O, WV-N, NCC, NJC, CGC, GSD Diva
Jerry Lee AXP, MJP, OAC, TN-N, WV-N, NCC, NJC, SPJ, UAG1