Newegg offers the Corsair Carbide Series 100R Silent Edition ATX Mid Tower Computer Case in Black Steel, model no. CC-9011077-WW, for $39.99 with free shipping via the directions below. That's the lowest total price we could find by $20. It features two 120mm fans, two external 5.25" drive bays, four 3.5" / 2.5" internal drive bays, seven expansion slots, and two USB 3.0 ports. Rebate expires March 31. To get this deal:

1. View the Corsair Carbide Series 100R ATX Mid Tower Computer Case for $59.99
2. apply coupon code "EMCEHHE24" to cut it to $54.99
3. redeem this $15 mail-in rebate for a final price of $39.99