Ceton InfiniTV 4 Quad-tuner Card $219.99

If this had come out before the $170 SD HR Prime I would have gotten it.

$170 HD Prime = $56.67 / tuner
$220 InfiniTV = $55 / tuner

So, close in price but the big difference is one more tuner per CableCard.

Well that and the Prime supports dynamic tuner sharing, which is great if you want to run HTPCs instead of extenders.