Quality files are hard to find. The great US made files are mostly if not all sourced from places like China, Mexico, Brazil, ect.
Just like most every other hand tool in the USA now.
Those work OK, but they are nothing like the older US made stock.
I often find older US made files for sale at flea market type sales and even gun shows. Sometimes a complete box of them,,priced by the file, sometimes the whole box. If they are something I can use I grab them.
Used files can be a good buy also, but you have to know the difference betw a dull file and an abused worn/dull file.
Either can often be bought for 25cents to a dollar each. Just about any size, shape, cut.
GArage sales, fleaMArkets, household sales, ect.
But an abused file is just that and has little to recommend for it.
(They are a good source of high carbon steel to make parts)
One that is just dull and not abused can be resharpened and will cut like new again
I highly recommend sending those to Boggs Tool & File resharpenimng Service in CA.
https://boggstool.com/
For anywhere from less then 1$ to a couple $$ the files come back clean and sharp as new.
Even those abused and less than perfect scarred ones they will resharpen (one time!) and they can be put to used use.
Some people even send in the Hecho in Mexico, Brazil, ect files,,brand new ones, and have them sharpened so they cut like a real file.
You can use the Vinegar soak and other acid soak methods to sharpen files but it just eats the edges of the teeth a little rough to give you some 'bite'. Not bad but nothing like what the sharpening service provides.
Treat files carefully. Scarring of the face is usually from one file running across another,,throwing one file onto another in a pile.
Sometimes you can't help it when filing and you strike a hard spot and it damages a file. Like a hard spot in a weld repair. But don't keep going. Stop and grind the offending klinker out.
Good files are expensive. Wood rasps even more.
It's nothing to pay 60$ and up for the correct rasp to shape stocks. But they are a joy to work with instead of a dreaded labor.
Yes they can get dull with use but can be 'sharpened' also.
Just don't run over the metal fittings with a rasp while shaping and they last a good long time.
Files, screwdrivers & punches,,,,,probably these tools I have the most accumulations of.