Ronten via Amazon offers Prime members the Ronten R2 Smart Bluetooth Fitness and Activity Tracker in several colors for $27.99. Coupon code "GOA3EB93" cuts it to $23.79. With free shipping, that's $66 off and the lowest price we could find. It tracks steps, calories, distance, and sleep and features a 0.86" OLED touchscreen display, Bluetooth 4.0, smart notifications, water-resistance, TPE band, and rechargeable lithium battery with up to seven days of use per charge. Deal ends December 31.