This Garmin Instinct Outdoor GPS Watch, originally listed at $209.99, drops to $149.99 at BuyDig. Plus shipping is free. This beats Amazon's price by $15, and other major retailers are charging as much as $230! It can track your heart rate, blood oxygen levels, stress, and physical activity. A built-in solar panel extends the life of the battery as you use it. Even without any solar charging, this watch will last for 14 days in smartwatch mode.