It appears as though Outdoor Life Network will be showing the AMA Supermoto series starting in mid-October.
Bonus! Supermoto is a very entertaining thing to see...
OLN usually carries the Canadian Superbike series in the fall as well...from what I can recall the last couple of years. Good for them...picking up the slack where SpeedTV has fallen off. The races are tape delayed a few weeks...but it's better than nothing.