Image: Jim Martin / Foundry If you want a giant smartwatch that lasts all weekend, the Apple Watch Ultra 3 is your best choice. But if you’re willing to sacrifice a little battery, you can get an Apple Watch Ultra 2 instead, which has the same design, nearly identical display, and most of the same features. And today, Amazon has one on sale for $549, a savings of $250 and the best price we’ve ever seen. With built-in GPS and cellular connectivity, the Apple Watch Ultra 2 keeps you connected...