Twice that I can remember, both times because of Zelda games. I bought Classic NES Series Legend of Zelda on GBA for $14.99 because I wanted the free Mario Shirt that came with it (buy a Zelda Game, get a Mario shirt, figure they'd have a Zelda shirt, but whatever). I got a GBA SP for christmas that year.
The other time was during a 50% off classic games at ebgames. Grabbed Zelda: Link to the past for a cool $3, knowing that I would one day again own a Super Nintendo. Took about a year and a half to find one cheap, but it was worth the wait not having to pay ridiculous eBay prices.