Jodi,
Check the phone book for the Greater Raleigh Dog Training Club, that would be a good start. <http://www.dogtrainingraleighnc.net/> This is another one I have heard positive things about. The Durham Kennel Club has some excellent instructors (and even some corgi owners active in agility and <http://www.durhamkennelclub.com> Seriously, you have a wide variety of facilities and training opportunities in the Triangle area and a number of corgi owners training in the area as well. I can check and give you some more referrals if you'd like.
Michael states:
"I know that at least some of the Pem clubs in the USA also organise non-championship agility events just for Corgis."
True, but many of them also offer championship agility events as well. The Palmetto club is working slowly to get approval to be able to hold trials for titles. We've recently approved changes to our constitution and by-laws in order to appease AKC so we be granted approval to hold such events.
Hopefully we'll see Maximus running at one of our trials in the future.
Debbie