offers the Apex MI-008 Mini-ITX Computer Case
along with a 250-watt Power Supply
in Black for $39.99
with free shipping
charges the same price, although it may take up to two months to ship.) That's the lowest total price we could find by $9. This open-air case for Mini-ITX motherboards features one external 5.25" drive bay, one external 3.5" drive bay, one internal 3.5" drive bay, one expansion bay, and more.
Update: newegg has since increased in price; however, Amazon still offers it for $39.99 with free shipping.