There aren't any Reagan coins that were minted by the USA that I am aware of. So the word that pops up to me is commemorative, which has more of a nostalgia aspect then any real money value.
From recent eBay results, these are not worth very much. While there are some claim to silver or gold plated, the presidential double eagles I've seen appear to be base metal. A few dozen have been...
I would guess what ever someone is willing to give you for it. I use averages on ebay and graigs list add 20%. People are hurting the economy is bad. People are selling things for 50 to 80% off. Its...