The 1989 Score Football Supplemental set is a 110-card extension of the main 330-card 1989 Score football set, released separately as a complete set. The cards, numbered with an "S" suffix, feature rookie cards for players like Eric Allen and Sterling Sharpe, a unique Bo Jackson card in baseball gear, and were sold through hobby dealers. The set is notable for adding more cards to the already strong 1989 Score checklist, which included other key rookies like Barry Sanders and Troy Aikman.