This modern Cassette Player/MP3 Player hybrid looks interesting. Sadly, it's only sold on Amazon.
https://www.amazon.com/Portable-Walkman-Cassette-Player-Built/dp/B0C1B7JD2F
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Honestly, this would be better. It's an audio cassette that has an SD card slot to load MP3s, turning any cassette player into an MP3 player, but it seems to have been discontinued for a while now.
