Re: 2 questions
I don't think they are worth alot, best way to do it is say to him "i have one, what do you want to pay for it?" he'll say "what do you want for it?"
You just tell him "I don't know what they are worth, but my friend sold one at a swap meet for $80, and i thought it was cheap"
So you will not get a yes or no way answer then. Just see what he thinks of your made up friends sale.....
You could probably get around $100, if you work it well. And if he really needs it.