Amazon's 48-hour Prime Day deal marathon is officially underway, and as expected, there are a lot of massive discounts offered for popular gadgets, ranging from the e-commerce giant's own Fire tablets and Echo smart speakers to an incredibly long list of top-tier Android phones.

The world's best-selling tablet and smartwatch families are unsurprisingly a big part of the extensive Prime members-only sales event as well, with savings starting at a relatively modest 75 bucks and capping off at a mind-blowing $430. Unfortunately, the life-saving Apple Watch Series 4 with cellular ...