I'm not sure if this has been covered before but I found a link ot this company who makes bags that you can put a camera inside. Instead of a hard case this one makes it easeir with a sort of built-in glove you use to control the camera. Cheaper alternative for those who can't afford a normal underwater enclosure.
Check it out..
http://www.ewa-marine.com/english/index.htm
and
http://www.popsci.com …1000004eecbccdrcrd/6.html


