Hardcore Pawn: Chicago (2013)

Season 1: Episode 16

A mother of her son away at college makes a deal with Wayne and Randy to sell his comic books for $100, after an expert they hired determined their value. However, she later called off the deal when she got a better offer from another dealer, who was offering her $200. They would later find out that that other seller was actually the expert that they hired. Furthermore, they found the reason why the expert wanted the comics -- it included a copy of Amazing Fantasy #15, which featured the debut of Spider Man, valued at around $12,000.