@boathugger: The current value of a Garbage Pail Kid card is based on which card it is and the condition of the card. Certain cards are professionally graded and can sell for much more than non-graded cards.
Some of the PSA 10 United States Garbage Pail Kids Series 1 cards have been sold for almost $200 per card. Most collectors are only interested in the professionally graded cards and that are graded with high marks. Having a high marked card essentially means it is essentially flawless and in mint condition.