Roll my own here. Tri-X, Double-X, Orwo N74 Plus and Orwo UN 54.
Long ago I had a high-quality plastic film loader, a genuine "ACME El-Cheapo" and rolled my own film, but bulk rolls became so expensive that I stopped it.
Now I will do that again, using cheap Orwo movie film, but it's more out of curiosity and because the season for street photography begins. In the USA there are obviously many people who use dirt-cheap Kodak 5222 Double-X film.
Today, I have four Leica cartridges, two that fit many Leica M cameras and two that fit screwmount Leicas. They are better than the cheap empty plastic or metal cartridges you get today because they have no felt gasket and don't scratch the film.