I am convinced that Church rummage sales are the way to go. There is usually a good amount of stuff gathered inside warm buildings and the prices are better than many thrift stores. (Why are thrift stores getting so expensive?)
I went to one in town and walked away with a couple fun things.
this wikipedia article on Studio cards. Apparently Box started off in the card business in the 1950's when humorous cards of this sort were not very common. I didn't find any like this on etsy vintage or ebay but I did find a newspaper ad for the ice bucket! The paper is from Dec. 7th 1959. Now that is cool!