Society of U.S. Pattern Collectors A website about patterns that are prototypes for coins that, for the most part, were never approved for circulation. Most patterns are very rare, some unique, and others unknown outside of museums.
American Gold Exchange, Inc. American Gold Exchange offers the highest-quality gold coins, silver coins, and bullion at extremely low prices. All of the classic silver and gold coins are carefully hand-selected for outstanding quality.
CONECA American national numismatic organization devoted to the education of error coin collecting and variety coins
David Sear Ancient Numismatics An author's site dedicated to antique coin collecting which offers books for sale, grading services, reproduction coins for sale and a coin resources page.
Ancient Coin Collector's Guild A non-profit organization website committed in promoting committed to promoting the free and independent collecting of coins from antiquity.
Dirty Old Coins Site dedicated to antique coin collecting and educating ancient coin collectors of uncleaned Roman coins. Also sells coin cleaning supplies.