Devices that use USB or firewire for capture seem to be a bit more pricey than some of the PCI devices that you can buy. You can get cheap PCI capture cards (Hauppage WinTV, for example) that offload all encoding to the CPU. Most of the laptop ready devices that you'll find have both a receiver and a encoder, freeing your CPU to do other work but driving up the price of the device. There are exceptions to this rule, though. Take a look at hauppage.com for some other products.
What sort of video quality/ file type are you hoping to end up with?
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