Advertisement Gallery has a ton of cool old tape player ads. Email them and maybe they'll find more. https://www.magazine-advertisements.com/
From all the queries I have read here shouldn't it say. "Thou shalt not be able to buy any working replacement batteries" Meanwhile, every Supermarket still sells AAs
I were trying to imagine "little did they know" with Japanese accent, failed... and then realized that what I was doing is totally inappropriate