ANTOnline via Rakuten Shopping offers the Lenovo ThinkCentre E73 Intel Haswell Core i5 2.9GHz Desktop PC (no monitor), model no. 10AS002KUS, for $399.99 with free shipping. That's the lowest total price we could find by $74. It features an Intel Haswell Core i5-4570S 2.9GHz quad-core processor, 4GB RAM, 500GB hard drive, DVD burner, Gigabit Ethernet, and Windows 7 Professional 64-bit with a Windows 8 Professional upgrade license. It includes a keyboard and mouse. Deal ends January 27.
Of note, enter coupon code "7MORE" to get 2,800 Rakuten Super Points. (They convert to a $28 Rakuten credit.)