How would you know that they were recorded once? Ebay has listings for over 5000 cassettes new. Why bother with used cassettes when new ones are so cheap?
If by "gently used cassettes," you mean ones that haven't been played to death and then left on the car dashboard, then just check out the local thrift stores. Most stores blow them out for a quarter. They usually include new and used cassettes. I am careful to check for the pressure pad because if it's missing you won't get any sound. Hope that helps.
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