Not sure if I can post this deal because it's sold by Amazon's preffered Merchant Indigostarfish.com.
I couldn't find it cheaper anywhere else online including ebay.
Designed to complement the Nike + iPod Sport Kit, Sportsuit Sensor+ is a finely crafted neoprene and rubber pouch that allows serious runners to attach the Nike + iPod/iPhone wireless sensor to the top of their favorite pair of running shoes. Works with iPod nano 2G, 3G, and 4G.
Marware nano Sportsuit Sensor+ The Sportsuit Sensor+ is easily attached and removed by slipping a small rubber strap underneath your shoelaces and fastening it with a strong velcro closure. Once in place,your iPod wireless sensor is protected from all the elements that serious runners encounter.