Lenovo offers its Lenovo IdeaCentre Q190 Intel Ivy Bridge Celeron 1.8GHz Desktop PC, model no. 57326004, for $549. Coupon code "USPQ1904925" cuts the price to $429.99. With free shipping, that's $119 off and the lowest total price we could find. It features an Intel Core i3-3217U 1.8GHz Ivy Bridge dual-core processor, 4GB RAM, 500GB hard drive, 802.11n wireless, and Windows 8.1 Professional 64-bit. (It doesn't have an optical drive.) Deal ends October 1.

Update: Specs corrected.