Good underwater equitment for DSLR?

Was wondering if there are any good underwater housing equipment for my Nikon D600. I've found a few on amazon but look very poor and rated a 1*. My price limit would be probably $300. I'm going on vacation soon and want to photograph some cool shots underwater & snorkeling. Don't want those rental underwater cameras that you get near the pier that everyone uses. I want to use my DSLR and get the top quality.

Http://www.ikelite.com/web_two/nik_d600.html