What is a 1oz. fine silver liberty one dollar coin from 2006 worth?

In 1986 the United States Mint, by an Act of Congress, authorized the minting of three different coins celebrating the 100th anniversary of the Statue of Liberty. There was a $5 gold coin, a $1 silver coin and a $.50 silver coin. The $5 gold coin is now worth about $300 in 'proof' (sealed in its plastic container) condition. The $1 silver coin is worth about $20 proof, and the $.50 silver coin worth about $6 proof.