I bought a Sealife Reefmaster mini. It's a great little camera for the price but I would suggest an additional flash it makes the picture sharper and more colourful. I purchased the flash fron Travel Sports Equipment in London Ontario Canada. They sometimes have auctions on ebay but if you go to their website you can buy the flash for $265.00 Canadian and they ship internationally. It's a great flash I have a buddy who bought a flash that was more than twice the price and isn't as good as this one. Hope this helps.
I dive and snorkel and use an A570is Cannon powershot. These have been discontinue by canon and upgraded so you can find them on ebay for a good price. i like them so well i purchased another one incase one floods. Canon actually had a great deal on the housings too for less than 100 this year due to being discontinued so you should be able to find a good deal on the housing. A lot of divers use thes camera too. Good luck. I would check canon for the housing if you can't find one cheap on ebay