Collectors can find stamp collecting price guides online at PostBeeld.com and Hobbizine.com. These guides offer filters and show the collector the current value of the stamp, which can change depending on demand.
At PostBeeld.com, collectors find an online price guide with access many resources to find the price of new and used stamps. The price guide includes foreign stamps and many rare ones. Some of the stamps date back to the 1840s. Collectors can also view stamps like their own that are currently available for sale.
Hobbizine offers price guides for collectible stamps printed in the United States. These guides are broken up by time periods with subcategories for specially designed stamps and rare stamps.