I've been searching for months now for these. I've gone so far as to contact the larger distributors to see if they have any old stock lying around that they don't have listed on their websites. I've contacted GoG directly to see if they have any left from the Smart Parts days and have not yet received a reply.

So, I'm reaching out to the paintball community, who has one collecting dust!?!
FYI, this is the regulator I'm talking about:
http://www.zdspb.com/tech/mguide/regs/main_inline.html