Find a list of U.S.proof and mint sets and their corresponding retail values on Professional Coin Grading Service's website, pcgs.com. Clicking on Price Guide in the navigation bar brings you to a page with links to proof and mint set price guides.
Multiple factors determine the value of coin sets. Understanding how these conditions influence the price of sets is a valuable skill for anyone interested in buying or selling coin sets. According to about.com, a great deal of value is determined by the number of coins that were produced in the set. If there are very few coin sets from a particular year, then their value increases because of their rarity.
The demand for particular coins may also increase their value. All coins also have a "melt value," which is what the coin is worth due to the resources that it is made of. In the past, coins that were made of silver were sometimes melted down by citizens when the value of silver rose. The condition of the coins is another large factor in price, with uncirculated coins being the most valuable. Dealer's values on certain sets may also vary depending on their personal stock of a particular set.