$20 OFF Coupon Code $20 Off Corsair Obsidian Series 650D (CC650DW-1) ATX Mid Tower Computer Case Now: $149.99 After MIR. Get Coupon Code CorsairOct24 $20 off Corsair Obsidian Series 650D (CC650DW-1) ATX Mid Tower Computer Case Now: $149.99 after MIR.