CDs I got at my library's book sale, wicked cheap

Haydn symphonies
Richard Strauss - Ein Heldenleben
Motion picture classics by Arthur Fiedler & the Boston Pops
Hallmark Music presents Wedding Sampler: Music to help plan your ceremony
Mega Dance Hits, Vol. 5 (e.g. "Dazz" by Brick)
Living in Oblivion: 80's Greatest Hits (e.g. "Poison Arrow" by ABC)
Billboard Top Rock & Roll Hits 1968 (e.g. "Tighten Up" by Archie Bell)
Frankie Goes to Hollywood - Welcome to the Pleasure Dome
Led Zeppelin - In through the Out Door
Roger Waters - Radio K.A.O.S.

and my favorite:

University of North Texas College of Music - 1997 Music Sampler