Mwave offers the iStarUSA 3U Compact Rackmount microATX Server Chassis
, model no. D-313SE-MATX, for $54.99
with free shipping
. That's tied with our mention from two weeks ago as the lowest total price we've seen. (It's a current best by $34.) It features a 15" depth, two external 5.25" drive bays, one external 3.5" drive bay, four internal 3.5" drive bays, front-side USB, power and reset switches, and room for up to four full-height add-on cards.