Kovel's Price guide. The truth is though if it isn't special they're really not selling, or they sell real cheap. That's why I suggested eBay. I knew they would be on there. Another reason I was stressing colors, age, rarity etc. I'm sure the jars are like $5.99 or something. Ball, Altas, are common. There has to be something special about it. Like embossed patent for example 1853 and it's amber. These are what bring value.