Well, I live in Riverside, Ca and purchased the vehicle in Pasadena. They gave me a great price I couldn't refuse, although it was pretty far.
There is a GM dealer in Riverside that is equipped to support hummers, but don't sell hummers

. They have worked on my brothers H2 a few times before and did a great job.
Cerritos is almost just as far and there is crazy traffic to get there and back.