Depends on the condition. The Kennedy proofs aren't worth much. They are known as "impaired proofs". Some people will make complete collections of them and sell as a group and make a few dollars. Go to your local top gold & silver buyer and buy a used Dansco folder and they will present the best. I toss them back now that I have them all but if I needed to make every possible dollar from the hobby I would do that. Same applies for the commemoratives. Check ebay for what they are bringing and how common they might be.
Maine_Jim