I can't see steaks being restricted to only these suppliers as long as they meet the size criteria. Kcbs is world-wide and you need to obtain meat locally to compete.
Per the email:
Pitmasters, the KCBS National Steak Championships is proud to partner with Creekstone Farms® and Double R Ranch® as the official meat purveyors to provide Choice-Grade Kansas City Strip Steaks that meet the specifications of the KCBS National Steak Championships.
No grill marks(scored down)2 meat suppliers, etc. the whole thing has to big a big joke, and they know it.