The same was asked a few months ago on Scubaboard. Gerard (gkndivebum) lives on Kona, dives SCRs and CCRs and gave Jack's, DiveTEK and Gaspro as sources. If memory serves me right they have a SCR instructor or two, but not all employees know about the rebreather related stuff.
Konaquatica as a source was highly recommended on The Rebreather List by Ron Benson after returning from a HI trip. They used YBODs, Megs and KISSes and got the needed supply of onboard and offboard tanks, gases and absorbant there.
Hope we get to C Cme's comments after checking out those places.
