eBay has the Samsung Gear S3 Android Smartwatch (4G LTE AT&T, SM-R765ADAAATT) for $220 with free shipping. Retail price: $350. Has excellent Amazon Reviews.
eBay has the Timex Ironman Move X20 Activity Tracker (Black/ Lime) for $39 with free shipping. Wirelessly syncs to iOS or Android smartphones, displays text alerts and incoming calls, and tracks workouts and sleep.