newegg offers the Gateway DX4350-UR21P Phenom II X6 2.9GHz Desktop PC
(no monitor), model no. PT.GBYP2.003, for $509.99
with free shipping
. That's $10 under our July mention and and a very low price for a 6-core CPU-equipped desktop. Features include an AMD Phenom II X6 1065T 2.9GHz 6-core processor, 6GB RAM, 1.5TB hard drive, DVD burner, Gigabit Ethernet, 802.11n wireless, and Windows 7 Home Premium 64-bit.