No Gas Gas shops in Phoenix (other than Mike's trials-only HardRock Trials, and that one is run out of his automotive fix-it shop -- not much to see).
If you want to gawk there are several mega-shops (Metro Motorsports on Bell Rd. and 67th-ish Avenue). Lot's of bling there but the experience tends to leave one with a dirty feeling. A big Harley shop is farther west down the road near Peoria sports complex. Lots of other shops (for wifey) in that area as well.
Now, if I could only get Nick to meet me in Bullhead City sometime next summer. I could take an '07 or '08 EC300 off his hands.