It's (strangely) signed by Orrin Keepnews in ballpoint pen within the booklet. I bought it used years ago from a local record store in Kansas City. Likely came from a private collection with the original owner having ties to the jazz community, as it's pretty ingrained culturally in this city...
Think Plaidroom Records has the Spidey in stock. Check their RSD page. Wanna say I saw it. Though it might not last until Sunday morning's online drop.