HP has a sale right now until 8/31, 30% off on all m9300t desktops $999 and up, including those with cablecard support.
Select the base m9300t and customize with Vista Home Premium for digital cable tunner. It will require the minimun upgrades: 512MB NVIDIA GeForce 9500GS and ATI TV Wonder external digital cable tuner + internal TV tuner. This will increase the price to $1099.99. If you select no additional upgrades, software, or accessories and continue to checkout, enter "DT9021" (without quotes) in the coupon box and press add. The price will drop to $770 plus tax and shipping fees will drop to zero ($839.29 for me).
Any other upgrades you add will also be 30% off. So base or maxed out, this is a great deal for anyone wanting an intro cablecard system. You can always add another cablecard tuner from Sony's website if you need two tuners.
Not sure if HP is shipping with TV pack yet. If they are, does anyone know if it's possible to upgrade Home Premiun w/ cablecard support to Ultimate w/ cablecard support after purchase? This would allow up to four cablecard tunners to be puchased later.