This is not a terribly difficult set - you can find lots and singles in pretty nice shape all the time on the cheap. For a 55 year old set, it's one of the easier ones to ALMOST complete. I say that because I have nearly three part sets, all missing #7.
Welp, I'll finally be selling off the other two part sets and singles because I have finally landed a #7. It took a group of 8 cards without #7 being identified to get it, but the set is finally complete.
Can anyone verify the scarcity of #7? Short print? It is the "Rock n Roll" card, 2nd from left, top row: