Hi,
Do used textbooks usually contain online programs that new textbooks have? Because I wanted to buy a used textbook but the only problem is there is an online program required for the course. I can purchase it separately but it adds up more than the package together.

Some used books might have a CD or a link+password for online programs. The only problem is that some of those programs have a time limit and expire after a certain period of time. So like maybe the person before you used the program and it expired a while ago.
Check with the prof or the person who's selling the book (like tell them that you wanna try it out and see if the program still works).

Some do most dont