They do have a testing center near me but they don't offer any of their services in Texas (in fact, we can't even do the Talent Search).
Squirt, I haven't looked at the specific test you mentioned, but I have emailed CTY about the Talent Search. They told me that in Texas we can take their Talent Search tests and participate in CTY's online courses but we don't get the other benefits like the regional awards. For that we have to go through Duke's TIPS program because that's our region. I don't know if this is the same info that you have found but I thought I'd pass it along. And if I'm wrong, hopefully someone will correct me and explain! I've found this whole "region" thing a little confusing!
