PricePlunge offers the Scosche Rhythm Bluetooth Cycling Speed and Cadence Sensor for $8.99. Coupon code "COLDPLUNGE5" cuts it to $8.54. With $1.99 for shipping, that's $4 below our mention from last spring and the lowest total price we've seen. (It's a current low by $8.) This device tracks and transmits cycling stats wirelessly to your iPhone, iPad, or iPod in real-time. Deal ends March 31.