(I hadn't checked this bit of the forum in a while - oops!)

I use the Hauppauge WinTV 34132 which uses the Connexant CX23880 chip. None of that specific version are on eBay right now but the last two that sold were cheap! There's a hacked driver for it I updated and improved, and it's usable on other cards with the same chip.

edit: There's an eBay seller with >10 Hauppauge Nova-S-Plus cards (CX23883, composite input w/o adapter) for $13 each (shipped) - ordered one to see how it works.

https://docs.google.com/document/d/1n5VArQenHNHE6e7Azq5iAt0L0Cr752LGJs7Vu7OYoRg/edit?usp=sharing is a (somewhat) live document with a lot of info scattered throughout.