Don't they need to sell blank tapes too?
They do: https://maxell-usa.com/product-category/cassette-tapes/
There are also others:
https://www.thomannmusic.com/compact_cassettes.html
https://revox.com/en/revox-news/now-available-revox-empty-ca...
alt Hacker News
They do: https://maxell-usa.com/product-category/cassette-tapes/
There are also others:
https://www.thomannmusic.com/compact_cassettes.html
https://revox.com/en/revox-news/now-available-revox-empty-ca...