I hate to be the bearer of bad news, but this comes across daily at where I work.
Late 80's to early 90's was the downfall of sports cards[with a few exception like 89 Upper Deck]
Think of it as this, if you have them, and you didn't really collect a lot, then everyone has them.
These cards are not worth the cardboard they are printed on. Your best bet, let them sit longer and longer in your closet, no harm no foul.
[list]Classic Jerry Colmanisms
[*]"Montreal leads Atlanta by three, 5-1."
[*]"They throw Winfield out at second, but he's safe."
[*]"Johnny Grubb slides into second with a standup double."[/list:u]