You should check ebay for your art bars, some of those may be worth more than the bullion because of the 80's melt down. I have one that is worth about $35 as a collectible.
Yeah Mvandemark is right. Some of the silver art bars especially the '70's silver art bars will be worth more than bullion value on ebay. You might come across one that has a very high rarity value and will see for a very high premium on ebay.
I don't have pics of everything, but here's some of my favorites: 2007 & 2008 First Spouse Proofs and Uncirculateds: Around $150 face value of Barbers:
