Classical Guitars
This is a list of many of the "Retailers" of new and used classical guitars. While some of these companies listed may compete with me in selling the same products of strings, I feel finding the guitar of your choice may need help from time to time and am willing to list their sites.
Classic Guitars International
http://www.classicguitar.com

Dan Zeff Guitars
https://www.danzeffguitars.com/index.cfm

GSP
http://www.gspguitar.com

Guitars International
http://www.guitarsint.com

Guitar Salon International
http://www.guitarsalon.com

R.E. Brune
http://www.rebrune.com

Trilogy Guitars
http://www.trilogyguitars.com