Ancestorville is a commercial web site selling ephemera -- but if you find one of your ancestor's ephemera, it might be well worth the look.
The web site is described as:
We sell lost family photos and antique paper ephemera items, and are dedicated to the reunion of family treasures. Our site has over 9,600 surnames and thousands of family photos, letters, ephemera, deeds, advertising trade cards, family bibles, cabinet card photographs, cdv photograph, Victorian calling cards, stereoview or stereoscopic photos, daguerreotype photographs, antique paper items and such. All related to genealogy and family history.
If this is your cup of tea, go for it!