I think there's a Nikon dealer in SD perhaps you can get a Nikonos but I don't think you can get any of the really good stuff here (but since I don't know everything I might be wrong), but even if you could it would be a lot more expensive than buying it in the US, it's expensive enough as it is. I have some stuff and I bought it
here, here,
here, and
here. Anything I need I buy in the US, get it shipped to my mailing address in Miami and pick it up when I travel. I try to avoid buying in Florida to avoid 7.5 % sales tax, since I get it shipped to Miami.
If you want a bullet proof housing check out any of
these.