Sue Best, Billy Best's adoptive (and recently widowed) mother, maintains this website:

Billy Best [alive and well]

The book promoted on the website came out in 2012, and my copy was just delivered in today's mail. A professional author, Linda Conti, helped Billy Best to publish a first-person account of the things for which he is famous. It's an easy, quick read. Amazon dot com sells it; of course, if you used the Mudcat link to link to Amazon, and you purchase a copy of the book, then Mudcat also benefits from the sale.