TigerDirect offers the COUGAR Solution ATX Mid-Tower Computer Case, model no. SOLUTION, for $19.99 with free shipping via the instructions below. That's the lowest total price we could find by $30. It features six internal 3.5" drive bays, three external 5.25" drive bays, 120mm rear turbine fan, and USB 3.0 ports. Deal ends December 16. To get this deal:
Corsair takes 50% off a selection of factory-refurbished products, with prices starting at $35. With shipping starting around $10, that's the best sale we've seen on these refurbished items from Corsair this year. (We've otherwise seen up to 50% off; this is a steady 50% off discount.) A 1- to 2-year Corsair warranty applies.
Mwave offers the LIAN LI Aluminum ATX Mid-Tower Computer Case, model no. PC-60FNB, for $109.99 with free shipping. That's $40 off and tied with our September mentionas the lowest total price we could find. It features five external 5.25" drive bays, one external 3.5" drive bay, four internal 3.5" drive bays, eight expansion slots, two USB 3.0 ports, and 120mm and 140mm fans.