Magnetic Card Readers For Linux?

Squeezer asks: "I'm working at a state library which has a new building under construction. The staff wants the building to run Linux for everything due to its stability. Our plans include a magnetic card similar to a credit card that has a magnetic strip. When a patron swipes their card, depending on their location, it will either let them: enter the library, print out a catalog on a book, let them print out an article, allow them to make a copy, and so on. I have been doing research but I am unable to find any magnetic card readers that support Linux. Any Slashdot readers have any advice or recommendations for such devices?"