What is the value of a Florida gold quarters set year 2004 minted in Denver and Philadelphia from US Monetary Exchange?

Gold-plating doesn't increase the value of any modern circulation coin. Private companies sell these items as "instant collectibles" but there's very little aftermarket demand for them. You may find a niche or specialty collector who's interested in them IF they're in their original holder, but numismatists consider them to be altered coins.