Hi, C:
When I was in college in Madison, Wisconsin, there was a juke-box supply house just a few blocks away that sold used 45's for a quarter. We're talking a long time ago, chronologically and musically. I picked up a lot of jazz 45's, stuff you'd never expect to see on a juke box... Oscar Peterson and Buddy DeFranco, The Four Freshmen, Stan Kenton, The theme from The Wild One with Marlon Brando. You'd never find that diversity of juke boxes today... the few that they hare are mostly oldies. Much of my collection of 45's came off of jukeboxes.
A tip for playing records... if you wash them with dish soap and water you can dramatically improve the quality of the sound. I have a lot of old 45's that sounded terribly scratchy until I washed them and got all the accumulated grime out of the grooves, and they sound almost new.
Jerry