When we first started working together we discussed you saving drafts in case they became desireable.
I was thinking of offering them on Kickstarter. I have no idea if anyone will want them, but I have to come up with a contribution that they will pay for them.
What are you wanting to sign and mail these if we have any takers. It might be better to go as low as you can to cover postage and some profit because the lower they are, may increase their demand. Also you can charge a bit more for a draft scene than you can for a character. I still have the notes we made on printing off the final scenes which is where I hope we make out profitably.