Newegg offers the Acer VM2631-UO23 Intel Haswell Core i5 3.1GHz Desktop PC (no monitor), model no. DT.VK7AA.004, for $519.99. With free shipping, that's $80 off list and the lowest total price we could find. It features an Intel Core i5-4440 3.1GHz Haswell quad-core processor, 8GB RAM, 1TB hard drive, DVD burner, Gigabit Ethernet, and Windows 7 Home Premium 64-bit. Deal ends July 22.