During the early and mid-1970s, whenever I drove through a small town with a five-and-dime-type store, I would stop and ask if they had any old records. Maybe one out of five stops was a score, as the owner would pull out a box of dusty 45s and LPs from a back room or the top of some shelves.
I rarely paid more than a dime for a 45 or fifty cents for an LP.
One of my scores was an original 45 of Teenager in Love.