I go to AB SEA all the time for books, he has the best collection of UW books around but as for housings, he mostly has the oceanhaus and Ikelite. Not like going to Backscatter where you can see a lot of different stuff. Although if you need a bulkhead for some custom housing only made in 1967, he probably has 6 of them.
CHeers
safe diving
BVA
Alan Broder at ABC photo in Los Angeles is extremely knowledgeable on UW camera systems. Just don't let the condition of his store fool you. It is iusually pretty messy, but he has a lot of gizmos that fit nicely into your Visa or American Express.
Also, if you get a chance (and if he still has it) go to his gallery next door. It is really nice...has blow ups from many professional photographers.
Joe
B&H sold me a defective Nikonos 15mm lens but the only way I could tell it was defective was to take it underwater. They wouldn't exchange it, were pretty rude and didn't seem to care. Good thing I had a USA warranty. Nikon was indded able to replicate the problem and they repaired my brand new lens.
I have used them since and their service has been pretty good. Reliable delivery, etc. I believe that at some point they recognized that the typical New York owned mail order service levels was losing customers. I have dealt with some real loser mail order companies (Abe's for example), but B&H seems to have recognized that servicing the customer and satisfying them equals retention. I have seen a significant change in their service levels over the last 25 years, unlike some other mail order operations.