Amazon is selling a $91 fitness smartwatch for $42, and shoppers say it's 'akin to a Garmin Forerunner'

TheStreet aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. Fitness trackers are not all the same. Runners, specifically, have special requirements for their smartwatches that not all devices can accommodate. Fortunately, some…