Buzz has authored or co-authored more than 20 books. He has offered many of those in signed versions. He has many of these signed options listed on his website but you can find them at much better prices on Ebay.
He did signings at bookstores back in the day. I got a couple that way.
Actually, at the signing I attended, he cancelled last minute but he promised to sign any books that were ordered and have them sent to the store, which he did.
Check around the site here, I believe Steve has a bunch of posts and videos because there are some Buzz items had AP or secretarial or selling/giving away facsimile items. Books you may be ok. It's been a while since I saw Steve's videos.