Making my own.
I tried my hand at knapping, all I got were turtles.. if you knap, you'll know what ybat is. So I thought, mumm, I have a 7 inch tile saw for cutting g slabs to pressure flake. I I cut some up using a flint I bought.
Mine are 1 x 7/8.
I used some flint I found, well commandeered...