I've done my own brokerage of CITES before. I don't ever want to do it again unless I was paid for my time and trouble. Personally I kind of suggest leaving CITES out of it (clams and SPS) because places like OA, SWC, J&L and our own LFS's bring that in all the time anyhow, and frankly I'm happier that they take the risk and not me. Nothing like spending a couple hundred on dead clams (been there, done that, burned the Tshirt).
Another thing is that a lot of US distributors won't touch an order unless you have an actual storefront with posted hours. I found this out when I was on my mission to find a S. gigantea carpet, and there were lots available in the U.S. and none in this country. That story had a happy ending, I gave Nate at Big Al's a few places to check into, and lo and behold he just found a place anyhow on his own, now Big Al's brings in S. gigantea every couple of months. You wouldn't have known that a year ago I had been searching for like 4 years for a way to get one, now it's easy.
Anyhow, just my $0.02 .... I'd keep it to zoos. But I'm just one person's opinion.
cheers