This is a very helpful explanation of how the ExtraBucks program works at CVS from two ladies called the DoubleSavingsDivas. I have mentioned this program, too, but not nearly as interesting than how a video does it.
The tactics mentioned are tried and true and I have used some of these, except that I try not to make people wait in line. Definitely look for the bar code scanning kiosk at the store to see what pops out when you scan your ExtraCare Card, though.
I will continue to post a few more relevant videos. The great thing about YouTube is that all subjects are covered, and one can learn just about anything for free.