Well for the reg(s), any place would do. But first thing is to figure out which reg you like (performance wise too), and what type of ASA/bottom line to get. That includes; on/off ASA's, standard ASA's, macroline kits or stainless steel hose kits. As for the pneumatics; 3way, LPR, and Ram. I would strongly recommend these following site(s):
and lastly: www.ebay.com
I apologize, I cannot tell you which inline regulator to get. Because I am not fond of those of inline regs, but I hear WGP, CP, Hybrid and Dye make some good ones. As for the pneumatics, I would recommend that you get (for the 3way); a wgp, a shocktech bomb, or a hollowpoint. For the LPR; wgp tickler, eclipse DART, or the eclipse/belsales evolution. And lastly the Ram; a wgp MP4, wgp STO (with qev's), or the Eclipse/belsales ram (w/qev's). Hopefully this helps you.