Magstripe Reader - PS/2 Interface - 2 Tracks (1&2) : ID 854 : $44.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: IT OSAYDE MSR90 90D USB Magnetic Strip Card Swipe Reader, 3 Track POS Magstripe Card Reader Mini Swiper Works with WINS & Mac, Plug and Play, Black : Office Products
Amazon.com: USB Magnetic Stripe Card Reader 3-Track POS Credit Card Reader Swiper Magstripe Swipe Card Reader : Office Products