Wow. That's a deal breaker. My wife and I have been saving since last year to purchase a H3 (and are within a few months of buying one), but with the nearest Hummer dealerships 99 miles away (Chattanooga), 120 miles away (Nashville), and 90 miles away (Birmingham), there's no way I can randomly take off from work to ever get the H3 serviced. VERY inconvenient.
The Hummer website said my closest dealership for service is my local GMC dealer (who doesn't sell Hummers). I also read on this board a month or so back that all GM dealers are now required to carry "basic" parts to fix any GM-owned brand vehicle (Saab, Cadillac, Hummer, etc.). Don't know how true that is, but it was posted here.
Guess it's time to start looking at another (easier-to-service and easier-to-acquire) vehicle.
