Where to buy a Opteka UC-SLR Underwater Case/Housing for Nikon?

In what store could i buy on of these? I live in the south florida area. Does best buy or walmart sell them? Or is there a camera store?

You can buy directly from the source
http://opteka.com/ucslr.aspx

You will have to look around in actual camera stores to see if they carry them. I doubt it, however, unless you have a store like the bh superstore in New York City