You could try making your own. Just start with a box out of acrilic(I would suggest that anyways, but go for any thinker plastic too) make holes wherever you want the fans with a drill....Cut open a box for the powersupply, cut open spaces in the front for drive bays.
Or ther eare also some of these, they are pretty cool too.
http://www.xoxide.com/clear-computer-cases.html the cheapest one there is 50$ is thats in your price range