A local steel supplier has a batch of armor plate from Austria that arrived exceptionally tough.
So tough actually they are unable to sell much of it because their customers break carbide bits on it.
I was unable to drill it with my carbide bits.
The stuff is 1/4 inch plate. the sheet is $1000 per 4x8 plus machine time.
The tool and die shop that did the grinding is now out of business. (owner retired) So just custom blanks only.
I will need to do a run of at least half a sheet to make it worthwhile. Cutting is with waterjet.
If you want a batch of strike plates or knife blanks, let me know via the contact form
I also can get regular armor plate.