I noticed in NotebookForums, there's a dude who's putting together an order for MiniPCI TV Tuner cards, which would come out to approximately $60 apiece, shipped. I thought I'd pass the info along, in case you're looking for something like this. Might be really sweet for a MiniPCI equipped MiniITX machine.
Keep in mind that this is a direct order from the manufacturer, and that there could be compatibility issues that need to be worked out. But you're all hackers, so I figured that's part of the fun for you.