PLEASE NOTE:

RFID Helps Florida Shoe Retailer Keep Its Customers From Walking Away - RFID Journal

gps_shoes
"Peltz Shoes has developed its own item-level RFID system to track the 30,000 pairs of shoes at each of its Tampa-area stores, improving inventory accuracy and reducing inventory-related labor costs."

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Also Check out Companion story from Feb 9, 2007:
GPS Shoes Make Tracking Kids, Elderly Easier