I have a Canon G-series camera that's great, but I hate, hate, hate the Canon housings.
My first housing was for an Ixus camera, and it had a faulty o-ring at the shutter button that took me two flooded cameras to figure out.
I switched to Olympus.
Then I went back to Canon for the G-11, with the OEM housing. But by this time, I had got used to the round port of the Oly which accepts threaded wetmount lenses directly, so the crummy Canon housing, with its rectangular port that requires an (expensive) adapter ended up being a huge PITA for me. Since I really hesitate to invest in an Ikelite housing for a cheap camera, I went back to the Oly and bought a XZ-1. I'm happy with the housing for it.
So, Mike, there's my story about the Canon housings.
Camille, I've used a Manila supplier for online purchases. They offered the best prices (including with comparison to Singapore and Hong Kong), were quickly responsive, and packaged the product very well, I ordered when I was in Bali for a week, and by the time I got back to Thailand, the item had arrived by FedEx. Very pleased. I'm off to dive right now, but I'll look up the supplier later if you're interested. Let me know.