Walmart has the Apple Watch Series 3 38mm GPS + 4G Smartwatch (White, Silver, MTGG2LL/A) for $199 with free shipping. List price: $379. Features GPS and a barometric altimeter track how far and high you go, dual-core processor for faster app performance, swimproof, ultimate sports watch and intelligent activity tracker.
Amazon has the Garmin vívoactive 3 Smart Watch w/ Heart Rate Monitor (2017) for $130 with free shipping. Retail price: $300. Features Garmin Pay mobile payment service and wrist-based heart rate.
Has above average Amazon Reviews.
Amazon has the Garmin Forerunner 235 GPS Sport Watch (Black/Gray, 010-03717-54) for $150 with free shipping. List price: $330. It features a sunlight-visible display, smart notifications, 11-hour battery life while training, distance, pace, time, and heart rate tracking.
Has good Amazon Reviews.
Walmart has the Apple Watch Series 5 44mm GPS Sport Smartwatch (several colors) for $414 with free shipping. Features 30% larger screen, waterproof, electrical and optical heart sensors, built-in compass, fall detection, GPS. Always-On Retina display.