I use a mix of purchased steel stock and used horse rasps and files from american companies. You have to really watch who the steel suppliers are. Lots of steel is made in China and is not consistant in metallurgy or characteristics from batch to batch. If you can get American steel spend the money and buy it. It will be consistant from batch to batch.
Heller Horse Rasps, Nicholson files, and Simmonds files are all 1095. They are made from quality American steel and respond to heat treatment uniformly.