Beauty is in the eye of the beholder!
Cardcow.com is one of the largest online vintage postcard dealers, buying and selling hundreds of thousands of cards a year and offering free basic appraisals along with paid formal appraisals for insurance purposes. www.cardcow.com
Delcampe is a European-based international online marketplace for collectibles with roughly 59 million postcards listed at any time, popular with dealers and collectors buying and selling at auction or fixed price. www.delcampe.net
eBay remains the largest general online marketplace for buying and selling individual postcards in the US, with an active deltiology community and the ability to set your own prices and auction or fixed-price formats. www.ebay.com
Etsy hosts thousands of independent sellers of vintage and antique postcards worldwide, often organized into curated shops specializing in particular themes, eras, or regions. www.etsy.com
HipPostcard is an online marketplace built specifically for buying and selling collectible postcards, with individual dealer storefronts organized by specialty and region. www.hippostcard.com
Mailseum is an online postcard shop and educational resource specializing in antique and collectible postcards, run by a dedicated reseller who also publishes guides on valuing, pricing, and selling postcard collections. mailseum.com
Mary L. Martin, Ltd. runs a large online postcard store alongside its own regularly scheduled auctions, and bills itself as the world’s largest postcard shop. www.marylmartin.com