Urban Legend: A store made good on its offer to sell stereos for literally “299 bananas”

Status: True.
In 1986, Silo (a chain of home electronics stores) ran a television commercial in 23 markets nationwide, offering stereos for “299 bananas.” They never thought anyone would take them at their word; after all, “banana” is a widely accepted, if playful, term for greenbacks. Who could possibly mistake one for the other? Thirty-two customers held the retailer to its unwitting word — they showed up bearing loads of the yellow fruit and demanding the store keep its end of the bargain.
Urban Legends Reference Pages: Business (Banana Skinned)