In the replies you can catch a new episode PBS Off Book titled "We ❤ Retro Media: Vinyl, VHS, Tapes & Film." With the increased interest of listening to music on vinyl and cassettes, I thought this video would definitely be worth your time.
Like the guy in the video said though, its not for huge editions and the cost has to be close to nothing. Cuz this labels only selling em for $4 dollars a pop.
Me, and a lot more people than you'd think. My band just released a cassette. And like the person above said Keep It Together and plenty of other labels release cassettes. It's an awesome and cheap to make format.