HP Direct has their slim HP AW016AV Pavilion Slimline s5280t Mini-Tower Desktop for a coupon deal. Make sure you upgrade your hard drvie to 640GB for FREE. It also includes a 2.5Ghz Intel(R) Core(TM) 2 Quad processor Q8300, Windows 7 64-bit, Intel GMA X4500, 6 in 1 memory card reader, 6GB of DDR3 RAM, DVD burner with lightscribe, MS works 9.0 and more. It’s $549.99 – $75 coupon (MU23597) + free shipping = $474.99 shipped!
Don’t forget HP’s $75 coupon: MU23597 (expires: soon)