Evan, There is a guy in Winter Haven Fl, Jim Bailey if I remember his website is
www.waterhousings.com It cost me about 1100, I have room for my pocket wz, flash and two ports one for my fish and one for the 28-135. If I was to do it again I would have gone with a more expensive setup so I could have full control of my camera. All I have is a trigger, so you need to set up everything prior to shooting. I have been extremely happy with the housing and I know there are a bunch of guys who use his products in the wakeboarding industry. The other thing is that you have to send him all your gear so he can custom fit everything so be prepared to be without your gear for at least a week or so.
I thought about getting a g10 with a housing, around 600 for the whole set up as an extra setup, shoot raw and manual not a bad way to go and much cheaper. email me if you have any other questions.
matthewroy@mac.com