Plenty of people have discovered close-up lenses from scanners, fax machines, mini-labs, fiche readers, etc. They can often be found for very little money, but adapting them to other gear can be a challenge -- for example, and they often don't have an aperture. Fujinon, Minolta and many others have made these optics and they are superb at what they do. But like great lenses, they are designed to be used under certain parameters, such as magnification and distance. Here are a lot of them:
https://www.closeuphotography.com/lenses