What is the difference between on-demand and self-study. Is it just
that the first is on-line and the second provides physical media?

Course 3101 and 3102 both offer self-study for $495 and on-demand for
$199. Course 7021 (which is a combo of 3101 and 3102) offers
self-study for $815. Trying to figure out the best route to go.