I found these plates at good will but would like to know where to get them new.?

These are black vitreous china - made in Italy by Arcopal in the 1980s. Try looking on eBay Italy (I have left you the link) and put "vetro nero" in the search box. You will find a lot of octagonal black glass items, but among them, you might get lucky. Or you might try putting "black Arcopal" in your normal eBay search box and see what happens. You might even try "Arcoroc" which is a French company that makes similar glass objects.

Happy shopping

When you hold them up to a bright light source do they look purple? If they do it's called amethyst glass. A type of depression glass. If this is the case they might be really hard to find, because they stopped producing a lot of this old glass (milk glass, cobalt, greenware ect.) many years ago. Good Luck

I have similiar plates but they are a deep brown and it looks like it is gold plated from the back. They are glass and look for a very small raised print on the backside.The letters are tiny.

I think they are from the 30s, art deco but them I maight be wrong.

Just to add to Mandy's answer, try searching on eBay to complete your set.

Good luck!

I think I have seen them at Fred Meyers a few years ago try e-bay now?

They look like these Melamine Shell Dishes.

http://www.ablekitchen.com/Shell-Dishes-s/3582.htm

why........can you eat of them..