Inside Ring Engraving Font Disks

I am looking for some additional Font disks for a New Hermes manual
inside ring engraving machine. Why are these so hard to find? Does
anyone have any (other than the standard block capital letter disks)
or know where to get any interesting ones??

Daniel J. Statman, Statman Designs

Stuller carries the extended gothic/tilted block dial, as well the
connecting script dial