Magicfly via Amazon offers its Magicfly Wrist Blood Pressure Monitor, model no. MF170, for $19.99. Coupon code "DR2HKQKN" cuts it to $14.99. Plus, Prime members bag free shipping. (Non-members can get free shipping with orders of $49 or more; otherwise, shipping adds $5.29.) That's $45 off and the lowest total price we could find. Features include support for two users with up to 90 records each, pulse rate, and auto power off.