Really cheap Media Center found via techbargains:

Staples has the HP Pavilion M400Y P4-2.8E 1MB Cache (Prescott), 512MB PC2700/80GB, 8x DVD+RW Writer, 6 in 1 card reader, TV Tuner with PVR, ATI Radeon 9200 Video card, Ethernet, Office Basic 2003 $1479 - $480 off $1479 coupon: 24449 (Exp 5/22) - $100 rebate (Exp 6/15) = $899 plus a FREE 17″ LCD monitor Upgrade. Free Shipping. Unit is fully customizable.

Additional $50 rebate for buying an HP Printer. P4-3.0E Ghz only +$30

Hit Customize, Make sure the following are selected: No speakers, HP Media Center Keyboard, hp 17in Flat panel-Speakers Not Incl. It should now add to the cart in this form.