Underwater housing for nikon d3100?

I'm looking for units, found one of ebay from Hong kong that's like 8 bucks, this is not trustworthy right? I'm trying to find one under 100 does anyone know where I can find one?

You might as well buy a point and shoot that can go underwater. You will shoot wide angle anyways when shooting underwater. Besides it's not worth spending thousands of dollars on a housing when you're camera only cost $500 or less.

Just my opinion.