John R,
Check out
www.digideep.com once on the site, go to the list of underwater housing manufacturers and select the brand of camera that you have (not EWA-Marine!!). The Ewa bags work but the rigid housings are more durable and take UV abuse better.
Most of these new housings for the consumer digital cameras are really cheap compared to what the 35mm housings run.
Once you have found the exact housing you want, see if B&H in NYC has a better price or not.
Good luck/
mark