What was your best garage/yard sale find?

Did you ever buy something at a garage or yard sale you thought looked nice but was otherwise cheap or had no value only to discover later it had some to great value? For instance, you purchased a piece of jewelry you thought was a nice piece of costume jewelry only to discover it was an heirloom piece with real gems that was worth way more than you paid? Or you purchased a small desk or something only to discover tucked in a hidden place or stuck in the back, collectible baseball cards, or something of great value. Ever have a situation similar to that in price you paid vs. value that was actually there, if so how favorable was it for you?