Vintage postcard collecting has become a popular hobby in the United States and elsewhere around the world. In fact, the average collector of vintage postcards and antique postcards would not describe the activity as a mere hobby, but more of a passion.
We have scoured the Internet to find as many helpful resources related to vintage / antique postcards as we could find. As a result, this page will serve as a "one-stop shop" for your vintage postcard needs.
VintagePostcards.org
This Canadian website offers what they say are "authentic antique postcards" guaranteed to be authentic. They also buy old antique postcards, and they have quite a few resources on the site related to antique and vintage postcards (newsgroups, collector's guides, etc.). Definitely worth a visit.
http://www.vintagepostcards.org
Curt Teich Postcard Archives
Curt Teich is the largest producer of antique postcards in the U.S. On this website, you can view more than 365,000 cataloged images of vintage postcards that were printed between 1898 and 1978. Today, the Curt Teich Postcard Archive is part of the Lake County Discovery Museum. It is recognized as the largest public collection of postcards. Photocopies and photographic reproductions of these vintage / antique postcards may be purchased, as well.
http://www.lcfpd.org/teich_archives/index.cfm
The Postcard Price Guide
This book is a postcard price guide that will help antique / vintage postcard collectors determine realistic pricing for a variety of postcard types, including artist-signed postcards, sports postcards, roadside America and more.
http://www.postcard-books.com
The Postcard Shoppe
According to their website, these are "dealers of vintage postcards and old postcards for the casual buyer and the serious antique postcard collector." They have a pretty extensive catalog, and you can purchase products online using PayPal or credit card.
http://www.postcardshopping.com
Postcrossing
This is a unique, web-based postcard project that allows people to exchange postcards from all over the world. Thus, it could be a great way to obtain some vintage postcards and antique postcards that might otherwise be hard to come by, or perhaps unique postcards from foreign countries (that are not necessarily vintage in nature).
http://www.postcrossing.com