I started putting prism tiles back together for fun awhile back. You can still buy zinc and copper came (came isthe metal bars between the glass if your not familiar) from Cascade Metals of Canada (through their vendors I should say). Size options that are the closest to original and fit the tiles thickness are very limited unfortunately. If your looking for advice on restoration feel free to ask me, or your local stained glass person. firstname.lastname@example.org Put prism glass in the subject section please.