Ever find yourself basking in the glow of a runner's high only to be shaken back to reality by realizing you left your wallet at home? With the right smartwatch, like the Garmin Vivoactive 3, that coveted post-sweat brew can still be yours. The Garmin Vivoactive 3 GPS smartwatch, which comes equipped with the contactless payment solution Garmin Pay, is currently on sale for just $147.50 at Amazon. It's usually $249.99, so this deal keeps more than $100 in your wallet (which you can actually just leave at home now, anyway). This watch made it into our roundup of the best fitness trackers for running, so you know the rest of its features stack up, too. Preloaded with 15 GPS and indoor sports apps ranging from running to yoga, the watch is designed to help you make the most out of your sweat session of choice. If you're looking to cool off at the pool, this waterproof watch can track of your swim stats and automatically upload data to the Garmin Connect app. Designed with Garm...