NothingButSavings offers the 4.7-lb. Dell Latitude 15 5000 E5550 Intel Broadwell Core i5 2.2GHz 15.6" Laptop for $688.48 with free shipping. Outside of the price below, that's the lowest total price we could find by $21, although we saw it for $2 less six days ago. Features include an Intel Broadwell i5-5200U 2.2GHz Broadwell dual-core processor, 15.6" 1366x768 LCD display, 4GB RAM, 500GB 7200 rpm hard drive, 802.11ac wireless, Bluetooth 4.0, 3-cell battery, and Windows 7 Professional 64-bit (includes Windows 8.1 Pro license).
A close price: Provantage offers it for $682.52 plus $8.45 for shipping.