Postcard clubs often have boxes where members can deposit their unwanted postcards. These postcards are then available for sale to other members and visitors, often for 10 or 20 cents each. The proceeds help to support the postcard club. I am always surprised at the treasures I find in these boxes. They may not be in mint condition, but they are treasures nonetheless.
Here are some of the cards I have rescued from the 20-cent boxes (the first one alone has given me at least $2 worth of laughs):
I am a member of two postcard clubs, the Webfooters, where I bought these fine cards for a total of 80 cents and the San Francisco Bay Area Post Card Club. Unfortunately, I don't live close enough to San Francisco to attend any of their meetings, but I like to support this club because they have a great newsletter and a fantastic website. Their reference links are amazing. Without their website, I never would have known that there are people who specifically collect corset postcards or that there is a Virtual Corkscrew Museum Postcard Gallery. I also noticed that one of the newer members in one of these clubs specifically collects postcards with accordions on them (there must be a law against that.)
Here are some other postcard clubs (in no particular order) that might interest you:
Pacific Northwest Postcard Club (Seattle, WA)
The Taconic Postcard Club (Yorktown Heights, NY)
Lehigh Valley Postcard Club (Bethlehem, PA)
Lancaster County Postcard Club (Lancaster, PA)
Rhode Island Postcard Club, North Providence, RI
Twin City Postcard Club (Minneapolis/St.Paul, MN)
Four Lakes Postcard Club (Madison, WI)
Heart of Ohio Postcard Club (Columbus, OH)
Capital of Texas Postcard Club (Austin, TX)
Tropical Postcard Club (Pompano Beach, FL)
Norske Postkortsamlere (Oslo, Norway)
Queensland Card Collectors Society (Brisbane, Australia)