I'm selling one of my SONY DSC-WX1 w/ Underwater Housing (Marine Pack). It's good to 130'. I've never had a single drop of water enter the housing. It seems to be a very well made housing.
What's special about this camera is the Exmor-R (backlit CMOS) image sensor. The low light imaging beats anything of similar image sensor size, hands down. I don't have any video with proper lighting (it's all handheld, spot lighting), but PM me and I'll send you a link to some videos. This is the camera I was able to capture the 2010-2011 CDF galaxy dive on (very low light).
I'd like to get $200. You can get the camera for around $100 now on ebay, but the housings are over $150 when you can actually get them.