Free online antique glassware price guides can be found on websites such as MillersAntiqueGuide.com and AntiquesNavigator.com. Kovels.com also offers a number of glassware price guides including Venetian glass and Bohemian glass guides.
Kovels.com maintains an archive of price guides for various antiques and collectibles such as glass, pottery and art. Some of the antique glassware price guides included on the website are Amber glass, Goofus glass, Amethyst glass and Depression glass. AntiquesNavigator.com has a good depression glass price guide that compiles information on what people have bought and sold for various items made of the substance including glass jars, vases and candle holders.