I have made my own scrapers for a long time, all you need is a saw plate. I find them all the time at the flea market for a buck or two.
I used a roto zip with a metal cut off wheel to cut them, But I have cut them with a file or a hack saw. I like saw plate because most are made of good steel.
The larger of the three I will grind to fit a molding that I need the smaller one is for the insides of my flutes I make, and the last one I will make a sq scraper out of. Normally, I get a few more scrapers out of a saw, but I am going to use the shorten end of the saw to make a handsaw that will fit my grandson, since most are way to big for his little hand.