Years and years ago, I bought episodes of the original footage from Kesey himself. I think his son Zane still sells them. Mine is a cool hand painted and signed VHS copy. I was surprised how closely the footage follows Wolf's story.
Babbs, Kesey, Mountain Girl, George and a few others do an intro to it, that I found hilarious.
As far as suggested 'furthur' reading, Sometimes A Great Notion (Kesey) and Man In Full (Wolf) are my two favorite books, but have nothing to do with the Pranksters, so I dunno if that is of any interest....