You can make one like mine out of 80/20 Aluminum for probably under $200 pretty easily, which compared to the one the OP linked, would be a deal as mine can hold two systems. I am going to modify it tonight to have the cards spaced and mounted off the motherboard.
http://i44.photobucket.com/albums/f39/sethmo38/Randoms/IMG_4085.jpgYou can by 80/20 extrusion off of eBay or Amazon(seller 80/20 Inc).
