Here's one
crazypc
there is at least one other out there, be wary though... I hear these clear cases are FRAGILE and hard to put together. Although everything man creates that is beuitiful, is. I was going to put my lanparty DFI in one, but...Nahhh.
Here's another
xoxide
If your a handyman (homedepot) you can just buy a bunch of plexi glass and uv paint. (The uv paint is clear in daylight)
and Design you own ^_^ . But the glass would proably be at least $50 and @least 20 for paint, you just paid for the prefab stuff.