There were a few made for the 1994 season. It depends on which one you have. The Upper Deck card is worth about $10US if it's in excellent condition. Collector's Choice brand is worth about $7 under the same conditions. Any "no-name" brand card is worthless.
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Considering he never went past the minor leagues with the White Sox not very much. I would keep it just because that is a cool thing to have.
I have found a 2006 SP Legendary Cuts Ray Schalk card on hotlistrookies.com for $2.95. Several are also listed on eBay.