The instrumental scores for all four Karate Kid films were composed by Bill Conti, orchestrated by Jack Eskew, and featured pan flute solos by Gheorge Zamfir. On March 12, 2007, Varèse Sarabande released all four Karate Kid scores in a 4-CD box set limited to 2,500 copies worldwide. This was the first official release of the original recordings — before, bootleg CDs would sell for $40–$120.
That’s right, according to Wikipedia, people were paying up to $120 for bootleg copies of the Karate Kid original score. On a related note, yes, I was browsing the Karate Kid Wikipedia entry at 10:00 on a Saturday night.