If you need inexpensive, US-made typewriter ribbon, try Baco Ribbon or Fine Line which can be had for pennies on the dollar (and it’s usually where most shops or re-sellers of ribbon are sourcing theirs). https://boffosocko.com/research/typewriter-collection/#Typewriter%20Ribbon
Most know about the blogosphere, but did you know there is also a small, but growing, typosphere?!?