A John F. Kennedy half dollar can be purchased from the U.S. Mint, eBay and Amazon.com. The U.S. Mint sells new 2015 uncirculated JFK half dollars as well as coins from years 2013 and 2014.
EBay and Amazon.com have a variety of JFK half dollar coins including the 1964 coin and the bicentennial 1976 coin, as of March 2015. The U.S. Mint sells 2015 JFK half dollar coins in a two-roll set of 40 total coins and also in a bag of 200 coins. EBay offers multiple bundles of John F. Kennedy half dollar coins from a variety of years and editions.