Hi,

I won't suggest those ebay subs, mostly they're jusy cheapie mini-subs that don't really last long after a few runs. I have one of those subs, O-ring seal is tight and cracked the rear plastic cap after only two or three runs... If you're trying to fit a camera inside one of those things, well, good luck.

My suggestion is to look for those ROV forums or buy a decent sub kit, plently of rooms there to fit all your electronics. Here's a link about the build up of a waterproof underwater housing for your camera:

http://www.rcgroups.com/forums/showthread.php?t=339195