Filming underwater with the Canon 7D: Underwater Housing

I've seen a couple of video samples online about underwater housing for the Canon 7D. One of the most impressive footage yet can be seen below. He is shooting 60fps using the SPL waterhousing. But the fact that it isn't easily available on stores like BH or Amazon is disappointing...SPL needs to start putting this out on the general market.

Luckily, there are a few other alternatives. Aside from a giant ziplock bag (not recommended), you could test out these alternatives below:

1. Opteka Underwater Case/Housing for Canon EOS 7D ~ $90
   
2. Ikelite 6871.07 eTTL Housing f/ Canon EOS 7D ~ $1,425
   

I have not personally tried out either option and will wait for Ikelite to give camera7d.com a free copy. But footage like the one shown below certainly is tempting me to buy one...