Don't Look Now! - Season 1 Episode 4 Episode Four

The gang decides to sell Jon's old bicycle to raise money to buy t-shirts, and instead end up selling Jocelyn's new bike. Jocelyn gets a reluctant Dylan to appear in their ad by promising him a date with Lisa. They owe $750 for making the ad but only raise $75 for selling the bike to Lisa, and Jocelyn is horrified that her bike only sold for $75.