Lenovo offers its Lenovo K450e Intel Haswell Core i5 3.2GHz Desktop (no monitor), model no. 57328801, for $579.99. Apply coupon code "USPK4500194" to cut the price to $539.99. With free shipping, that's tied with our mention from last week, $259 off list, and the lowest total price we could find. Features include an Intel Haswell Core i5-4460 3.2GHz quad-core processor, 8GB RAM, 1TB 7200 rpm hard drive, DVD burner, 802.11n wireless, and Windows 8.1 64-bit.
Note that this item may take up to three weeks to ship.