[link|http://www.newegg.com/app/ViewProduct.asp?catalog=7&DEPA=1&submit=property&mfrcode=0&propertycodevalue=3812|http://www.newegg.co...rtycodevalue=3812]

You can also try Directron:
[link|http://www.directron.com/allmid.html|http://www.directron.com/allmid.html]

Both of those vendors are cheap, reliable, and a pleasure to deal with.

Depends on how cheap is cheap for you. Antecs/Chieftechs start at around $65 or so.