Molar removed/bone graft - what is the average cost for these procedures?

The answer is yes. You can most definitely have a gum/bone graft without dental implants. There are several indications for this and your concerns are very valid from a clinical standpoint. In fact, your bridge might be supported much better in many instances following gum/bone grafting. You...

If you are talking about orthodontically moving teeth into grafted bone, I wouldn't recommend it, but that is a better question for an orthodontist.

Your dentist is right, you need to place the graft in the socket immediately after the tooth removal. If you wait, the bone will dissolve away and you will have a gum defect that will be very hard to repair.