I've stumbled onto these online and noted they are made of the auto body repair man (another professional) and wonder if they are any good.
I lucked out last year, finding myself in an old-time hardware store here in Anchorage and, in their files area they had a lot of US Nicholson's that had obviously been on the shelf for many years (hiding behind their large, new stock of Mexico chisel) so I picked up one of each (totaling about a dozen files). I've only used a couple to date and their use has been limited but they performed flawlessly in my use.
Still, I'm curious if there's another potential future source.
Jim in Alaska