A best bet is the HP Pavilion p7-1446s AMD A10 3.4GHz Desktop PC (pictured), model no. H3Z36AA#ABA, for $499.99. Coupon code "45582" drops it to $424.99. With free shipping, that's tied with our March mention and the lowest total price we could find today by $175. It features an AMD A10-5700 3.4GHz quad-core processor, 8GB RAM, 1TB 7200 rpm hard drive, DVD burner, 802.11n wireless, Bluetooth 4.0, and Windows 8.
Hewlett Packard Pavilion p7-1515 Desktop PC (H3L36AAABA) (887111831835) is also available at these stores