I saw a post by Sports Collectors Daily on Facebook about this auction up on ebay right now.
A PSA 9 1975 Topps Cello with George Brett on the front and Robin Yount on the back.
You can follow the auction HERE. As I'm writting this the auction is already over $1700 with over 4 days left to go. SCD called it a holy grail of cello packs. Maybe for a Brett collector, but for a Yount collector the Yount would have to be on the front. Still pretty neat, and well out of my price range.