Amazon offers the Ozeri CardioTech Premium Series Digital Blood Pressure Monitor, model no. BP2M, for $33.60. Clip the 25% off coupon code on the product page to drop it to $25.20. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.49.) That's the lowest total price we could find by $5. It features auto inflation, hypertension color codes, and irregular heartbeat detection.