Costco offers Apple Watch Series 3 from $279.99 shipped. You’ll need a membership – or know someone who does – to cash in on the savings. Free shipping is available across the board. Today’s sale is primarily focused on GPS models, in both 38 and 42mm sizes. Series 3 deals have been harder to come by this year. Our last mention started at $297, making today’s offer amongst the best that we’ve tracked all-time. Shop the entire sale here.