Dave,
Here are two I know of William is a great guy, I have not bought from him but have conversed about his ATM work on his equatorial mount. He is also a member here on these forums. And often visits down under on observing road trips. He is I believe the main Vixen dealer in HK.
http://www.geocities.com/tatsco/index.htm
Second is Grand Eye, again came across this while searching for EQ6 mounts.
Best to email for pricing, again I have not purchased anything. But some prices are hard to beat even with shipping while others are comparable.
http://www.grandeye.com.hk/
Regards
Fahim