You do not need a TV card to do that.
Most new digital cameras come with an IEEE1349 (FIREWIRE port) and USB 2.0 ports. As the image is directly streamed in mpeg2 or other digital encripted video file, you can download it directly to your laptop.
You'll only need the TV card if you want to tune in on some TV channels as the signal must be picked up by a tuner and then coded in a format wich can be handled by your pc (and normally isn't mpeg or avi either it's something the program that came with your TV tuner can understand).
Good luck on your search.