If you have the misfortune of being in the Boston area, you could relieve some of that pain by visiting the MFA for The Postcard Age, and exhibit of selections from the Leonard A. Lauder Collection. The collector himself will be doing a talk on his collection on March 6th. While you're there, hit up the European Posters exhibit too.
Leonard Lauder also has a collection housed at the NYPL. The Detroit Publishing Company Postcards are available to view online and show mostly cityscapes, landmarks and natural beauty, but also things like this:
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