I really do not like dealing with storage units because there is a lot of junk in some of them (and I tend to be a hoarder; and my garage is super full already), but if I found someone around me who was willing to buy any books they find, that would be helpful :)
Good luck in everything!
Btw, I'm going to share tomorrow my story of how I went from $250 to 6-figures on Amazon. As you seem an entrepreneurial person, who seems to have fun doing what you do, I wonder if that's something you might be interested in. I'll try to send you a link and get your feedback on it.