Glass mosaic tiles are also called vitreous tiles and can be made from sheets of stained glass, mirrored glass or made as tiles.
Here's are some listings of mosaic tiles and other types of glass that are for sale on Ebay. Ebay seems to be the
most reliable place to get a good assortment of glass and other types of mosaic tile. When I find good sources of mosaic tile, I
try to add the web sites and stores to the listings on discountmosaictile.com. These glass
tiles are for sale at dickblick.com and Mister Art.