Colorful Blur via Amazon offers the Lemfo Fitness Tracker with Heart Rate Monitor for $36.99. Coupon code "6BV34RG9" cuts the price to $23.67. With free shipping, that's tied with last week's mention, $13 off, and the lowest price we could find. It monitors heart rate, sleep, steps, distances, and calories burned via the Lemfo Band app for iOS or Android. Deal ends January 31.