Collectors Book Online
Collectors' price guides.
http://www.collectorbooks.com/
Krause Publications
Specializes in antiques and collectibles.
http://www.krausebooks.com/
Mom and Pop Stores
Books showing antique country store items and saloons and breweriana and their values.
http://www.momandpopstores.com/
Rugbooks.com
Books on Oriental rugs, carpets and other ethnographic and historical textiles.
http://www.rugbooks.com/
Sirlampsalot Publications
Offering kerosene and oil lamp catalog reprints, as well as related trade cards, advertising covers and broadsides.
http://www.sirlampsalot.com/
The Charlton Press
Offers a variety of books and price guides related to collecting and collectibles, especially 20th century.
http://www.charltonpress.com/