My chiro does upper c adjusting, he doesn't use the ultra high tech equipment.
So you might be able to find some that have studied it ,but are not listed as a specialist or use the expensive equipment.
Checking for chiropractor websites and calling the offices and asking them questions about it is a good way to find others that do the treatment.

I just added some links & videos about upper cervical care in the PCS useful sticky thread ( above the main thread list) -
http://neurotalk.psychcentral.com/thread19462.html