Used lawnmower blade.
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Used lawnmower blade.
Sent from my iPhone using Tapatalk
Old flat file.
Another DIY option: http://www.thompsonsknives.com/#Items
When I was a kid, we made knives from old files as suggested above. I'd suggest rummaging through some garage sales, or thrift store tool bins. Some times at flea markets, someone will have a big bin of old tools.