How much is the republic of panama proof set is worth minted at the Franklin Mint?

One of the best websites to determine the asking and selling prices for this and other coins is on eBay. First identify the year that the proof set was issued and search accordingly on eBay. Once you get one or more matches, click on to "completed listings" and you will see the actual prices for which the proof set or other coins sold. Please make sure the pictures of the items sold match the item in your possession. The 1975 Panama Proof Set (containing the 20 Balboa coin) issued by the Franklin Mint has sold on eBay for prices ranging from $149.00 USD to $275.00. Some current auctions (as of 7/17/2012) are asking over 300.00 for this set.