I own a deck of Gambit cards from the 1970s run; it’s the only complete one I know to exist. Purchased it from a seller in Europe eight years ago; he’d had it in his playing card collection since the mid-1980s. That was a fluke though; it was on a personal site (not auction site) and I wouldn’t have seen it if I hadn’t been searching for something else.
Other items in the collection, found at various times on eBay: a single card from Card Sharks, a question card from the 1970s Joker’s Wild, and the money slides from the Bullseye bonus round.