[all variants] Good TV Tuner Card?

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http://ubuntuforums.org – Do TV Tuner Cards actually work on X/Ubuntu? If so, can someone suggest a good one that accepts Digital TV Signals (ATSC), but won't hurt my wallet? (IE: It can't be more than 65 USD). I already have a nVidia 1 GB GTS 250 graphics card, so I don't need or want one that is integrated into a graphics card. (Hardware)