Borderlands Bookstore

Online bookstore run by George Farias out of San Antonio, Texas. Carries many genealogy and history books relavant to the group's region, including being the sole U.S. distributor of Luz Montejano-Hilton's Sagrada Mitra de Guadalajara.
http://www.borderlandsbooks.com

Libros Latinos

Latino subject specialty bookstore out of Redlands, California. Carries many microhistory books.
http://www.libroslatinos.com

Fondo de Cultura Economica

Mexican government publisher that prints academic works ranging from history to anthropology and literature. This is a great source for reprints of old history and Mexican literature books.
https://www.fondodeculturaeconomica.com/

Bookfinder.com

Meta search engine that includes the catalogues of many used bookstores around the country, facilitating finding out of print books.
http://www.bookfinder.com