Seacam announced the Prelude Series of their underwater dslr housings. Fitment for the recently released Canon 60D and Nikon D7000 would be initially available. The Seacam units are well regarded for the materials, construction, ergonomics and modularity. I specially like the option to swap marine viewfinders. The Prelude would be 40% cheaper than full function housings (all camera buttons press-able) for bodies like D3 and 1Ds, the trade off is reduced buttons on the waterproof case. If you do not make a lot of camera setting changes while photography diving then this could be your ticket into the world of premium quality Seacam systems.
You can buy submarine housings for various cameras from these retailers:
Amazon
