Amazon offers the MIO Alpha I Strapless Continuous Heart Rate Monitor in Black/Black, model no. 53P5C2L3, for $132.99 with free shipping. That's $16 below last month's mention and the lowest total price we could find now by $36. It features a continuous heart rate display, user-settable heart rate zones with visual and audible alerts, data review, timer/clock, and smartphone compatibility via Bluetooth 4.0.

Update: The price has dropped to $132.43.