ABC7 News was at the University of San Francisco for the KUSF Rock 'N' Swap.
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For 34 years, both casual and serious collectors have been coming here several times a year to sift through the bins, hoping to find a rare gem.
It's the city's largest record fair, attracting dealers from around the state.
Organizer Miranda Morris says, "There's a lot of music out there that's not downloadable, it's not online, it's rare, it's just happen stance, kind of like internet browsing, but in the real world."
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The first Rock 'N' Swap was held in 1983 and admission has remained the same since it started-just $3.
A portion of the money raised goes to support the university's online radio station KUSF.
If you missed Sunday's event-the next one is scheduled for Sunday, February 11th, 2018.