For me it was 1973, I discovered Columbia House 12 albums for a penny. I got collection company letters for a year or 2 after that. Perhaps influenced by a book given to me by my neighbor, Abbie Hoffman's, "Steal This Book," I never gave Columbia House even a second penny.1969 discovered the Record Club of America, AFAIR, 10 albums for $1.00(?!)
Steppenwolf, Rest In Peace
Chicago V
Led Zepplin IV
Simon and Garfunkel's Greatest Hits
Beatles White Album
Who's Next
Deep Purple, Machine Head
I suppose the others were forgettable.