The cellular model of the Apple Watch Series 3 is still on sale, even though the deal on the GPS-only model sold out. At about $230, it's a good deal.
It has excellent fitness tracking, a heart rate monitor, a slick modern design, and great app support.
The cellular version can connect to your cellular network so you can leave your phone at home. With a data plan, you can use the Apple Watch to take and make phone calls and messages without needing to have your phone in range.
If this deal runs out, you can always buy the Series 3 from Apple directly and get a $25 Apple Store gift card with it.
Get the Apple Watch Series 3 Cellular 38mm from Walmart, $229 (originally $379) [You save $150]