They are a very heavy glass, light green in color with octagon shaped bottoms.
They are similar in color to depression glass but are much heavier.
I looked all over Ebay and could not find anything, then I went to Replacements.com and looked all over there.
I finally found out that they are Fostoria - Moonstone Green, made between 1974-1982.
Mine seem to be the ice tea goblets and they sell on Replacements.com for $25.99 each!