Dell Small Business offers the Dell OptiPlex 3020 BTC Intel Haswell Core i3 Dual 3.5GHz Desktop PC for $639. Coupon code "?73Z7R69RRG59K" cuts it to $539. With free shipping, that's $374 off list and the lowest total price we could find. It features an Intel Haswell Core i3-4150 3.5GHz dual-core processor, 8GB RAM, 500GB 7200 rpm hard drive, DVD burner, and Windows 7 Pro 64-bit (with an optional Windows 8.1 Professional license). Deal ends December 18.