Dell Small Business offers its Dell OptiPlex 9020 Intel Haswell Core i5 3.3GHz Small Desktop PC for $649. Coupon code "BONUS100" cuts it to $549. With free shipping, that's $617 off list and the lowest total price we could find. It features an Intel Core i5-4590 3.3GHz Haswell quad-core processor, 8GB RAM, 500GB hard drive, HDMI, USB 3.0, and Windows 7 Professional 64-bit. Deal ends September 19.