Hi there, I am happy to help. Donnie Register, owner of The Antique Market on State Street in Jackson, said the Bicentennial stamps are worth little more than the face value. Register, who buys and sells stamps and coins, said the U.S. Postal Service began mass producing commemorative stamps in the 1960s and 1970s, flooding the market.
Ebay is a good source to get an idea on what people are paying for items! Thanks for the question!