Spectra8 $325

Conexant BT878 video capture chipset
4-8 channels 
30 fps
768x576 
Win 98/ME/2000/XP, Unix and Linux 2.2, 2.4 and 2.6

Osprey 100 $144

1 Channel
30 fps, with CPU utilization at about 1 percent.
640x480