S02E21 Three Men and a Comic Book
Bart attends a comic book convention and decides he wants to buy the first issue of "Radioactive Man" comics for $100. He tries and fails to earn the money in various ways, including helping elderly neighbor Mrs. Glick, who works him like a horse then gives him a quarter. So Bart decides to go in with Milhouse and Martin, both of whom want the comic, though neither has enough money. When they chip in to buy the comic book, their friendships may be over as they turn to jealousy for the book.