What, I have to be the first one to say it....?
www.eBay.com
Best dive deals on the planet, best thing to happen to the internet. Changed my life. I sell stuff to buy dive gear. There is no better place on he web for me. about 90% of my gear came from eBay - regs, fins, hoses, BP/ Wing, harness, lights, bags, etc. Don't be a fool and dive to your death. Have every life support piece of equipment you buy checked by a qualified technician.
Others include:
http://dive-ssa.com/
SSA - I drive about 70 miles round trip to get fills from these guys and sometimes just hang out. Dan (who runs the place) Brian and the entire crew are great. I love these guys, I dive with these guys, I trust these guys. They're my number one shop. 2 stores - one is just too far (about 60 plus) but that's the one I did all my AOW through. Shoot me now.
http://seastallion.com/
SeaStallion - after the DUI Demo days in San Diego, these guys called and followed up. They're a good 60 or 70 miles (one way) from my home. I ended up buying my wife's 350 from them, as well as our drysuit courses. FOLLOW UP PAYS. Too far for an ongoing relationship, but they get it. Quality people, quality store.
http://reefscuba.com
Reef Scuba - all of my hardware and nick nacks (bungee, webbing, bolt snaps, etc.) come from these people. They ship UPS 3rd day, which always gets to me in 2 days! They always toss in a little extra something in their packs ("Lagniappe", right FredT??
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Honorable Mentions
http://oceanadventuresdiveco.com
Ocean Adventures - Steve is the bomb. These guys are local (3 miles from my place) and probably my fave "local" shop. They get my emergency purchases, the occasional trip and that's it. As I do 99% on line, I don't have much for them...but they're quality people.
http://www.lloydbaileysscuba.com
Lloyd Bailey - had the ACB in stock when I called. Arthur took my order. Lloyd himself called me back to be sure I got it in time for the dive, etc...what a sweetheart. Free freight on Halcyon.