I found some mother of pearl (pieces of polished oyster shells) on ebay and it came in about a week and a half. There weren't very flat and there weren't very white.
I traced the fret board and drew out the inlays.
I cut the paper inlays out and glued them to the backs of the mother of pearl.
After a miserable attempt to cut them with the scroll saw I switched to this set up. That's the pearl clamped between two pieces of wood and a manual coping saw. It's slow going and they crack easily in the vice. It's the least worst way I've come up with to cut them so far. They're way too small to hold onto while cutting them anyway.