MSI Theater 550PRO
 

For the cool price of $74 USD, the MSI Theater 550PRO is a pretty good
value when compared to many other TV Tuners, including ATI's own TV Wonder
Elite which goes for almost double the price. Considering there isn't much
difference between the two in terms of software bundles and hardware, we'd
lean towards MSI's version of the card if you're in the need of a tuner
for your HTPC box.

http://www.viperlair.com/reviews/multimedia/msi550/

It sure gets smaller.