Amazon has the Garmin vívoactive 3 Smart Watch w/ Heart Rate Monitor (2017) for $156 with free shipping. Retail price: $300. Features Garmin Pay mobile payment service and wrist-based heart rate.

Has above average Amazon Reviews.

Amazon Offers Save up to 41% off on Garmin Smart Watches shipping is free on all orders for Prime members.

• Garmin Instinct, Rugged Outdoor Watch with GPS, Features GLONASS and Galileo, Heart Rate Monitoring and 3-axis Compass (Graphite) for $200
• Garmin Venu, GPS Smartwatch with Bright Touchscreen Display, Features Music, Body Energy Monitoring, Animated Workouts, Pulse Ox Sensor and More (Black, 010-02173-11) for $300
• Garmin vívoactive 3, GPS Smartwatch with Contactless Payments and Built-in Sports Apps, White/Rose Gold for $170

Amazon has the Fitbit Versa 2 Health & Fitness Smartwatch (several colors) for $130 with free shipping. List price: $200. Features always-on display option, heart rate monitor, sleep tracking.

Has good Amazon Reviews.

Amazon has the Casio Men's SGW100 Twin Sensor Digital Watch (Grey, EAW-SGW-100-1V) for $24 with free shipping on $25+ or with Prime. List price: $33.It features twin sensor and temperature and direction readings into a 200M water resistant. Display range: -10 to 60 C (14 to 140 F),Display unit: 0.1 C (0.2 F). Has good Amazon Reviews.

• Casio Men's SGW100 Twin Sensor Digital Watch for $23

eBay has the Refurb Citizen Men's Eco-Drive Proximity Bluetooth Watch (BZ1000-54E) for $100 with free shipping. Features stainless steel band, 46mm case, analog display, quartz movement, water resistance to 328 feet.