Apple Nike Amp+ Watch Remote, 3 iPod Nano Sport Kit Sensors, plus 2 Watch Bands | eBay
Amazon.com: Sensor Pouch for Nike+iPod Sport Kit Sensor : Electronics
Bean Pod 2 Pk: Universal Nike+ iPod Sensor Holder - Nike Plus iPod Sensor Cases, Works w/ All Shoes: 1 Red Sensor Shoe Pouch and 1 Blue Sensor Shoe Pouch | Amazon