When one thinks about it, you can't call it a yard sale because you are not selling your yard, same goes with a garage sale. Tag sale, well you aren't just selling tags, so you can't call it that either.
But we do anyway.
Generally to me, its a yard/garage sale, and if there is one within bikeriding distance, I go to it. There have already been many this year, and one of them had an old Mac Laptop for $15. Unfotunately, no power adapter.