Now that I bought a used one, I noted yesterday that B & H is selling selected housing kits with Sea & Sea MDX-D300, a port and a YS-110a with sync cable on sale for not much more than I paid used. These are a killer deal while they last. I think it was about $3K for the housing, std. port and strobe/cord and about $4K if you opted for the optic glass dome. I think they had a similar deal on MDX-D300s. Check it out if you're in the market. If you don't have the camera, I think you can pick up a D300 for like $1299 now.
MDXD300 housing kit
MDXD300 housing kit
