Yard sales are great for selling cheap stuff. The last one I did I had some cheap sets and a boxful of 91 score I'd gotten along with a bunch of old british cards. (Used as packing material, about 2-3000 of them and most of a set in pages and a binder.
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The sets were $5 each and the box of commons $10. All gone by 10am the first day. Same for the stuff I put out the next day.
I've sold some vintage at yard sales, I keep it aside and bring it out for people who ask about older cards. I usually have that stuff priced about what it would go for on Ebay and give a nice discount if someone is reselling or wants a bunch of them.
Steve B