Overview: Chum has a cow when a seller comes in with a giant collection of figurines from "The Simpsons." Will the seller score some D'OH, or walk away Groening? Meanwhile, Corey checks out an old playing card shuffler. Will he stack the deck, or fold? Then, a seller shows off his original copy of the film Ben Hur. Will Rick take a victory lap, or will the negotiations be a drag? And later, Rick and Corey head out to the range to check out a mountain cannon. Will the deal go off with a bang, or will it all just blow up in smoke?