Heart Rate Monitors USA offers the Garmin Forerunner 230 GPS Running Watch & Heart Rate Monitor in Purple Strike or Black/White for $149.99. Coupon code "FORERUNNER15" cuts that to $134.99. With free shipping, that's a $24 drop from four days ago and the lowest price we've seen. (It's the best now by $20.) It features heart rate tracking, steps, distance, calories and sleep tracking, and smart notifications.