Good source for books

There was a book I wanted for Christmas, but did but did not get. Looks like its time to buy it. Can someone please recomend reliable, inexpensive sources for numismatic books? Thanks.
I collect circulated U.S. silver
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Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
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The Clashed die Morgan book is offered on Ebay now and then.
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Check out the Southern Gold Society