Daily Steals offers the Withings Pulse O2 Activity, Sleep, Heart Rate & SPO2 Tracker in Black or Blue for $44.99. Coupon code "DNEWS02" cuts the price to $40. With free shipping, that's the lowest price we could find by $10 and the best price we've seen. It tracks steps, elevation, distance, running, calories burned, heart rate, and blood oxygen level and features real-time coaching via the companion Health Mate app for iOS and Android.