Deal: Apple Watch Series 3 gets a $50 discount at Best Buy0
First off, it's worth mentioning that Best Buy has both the GPS-only and cellular models on sale and prices start at $279, exactly $50 cheaper than the MSRP. Depending on the model you choose (38mm / 42mm, cellular / GPS), you could pay up to $379.
If you can't afford to pay the smartwatch's full price, you can activate it with AT&T and pay $17.95 per month for 20 months, which will save you exactly $50. Some models can be activated with Verizon, but you'll have to pay the full price, minus the $50 discount.
Also, everyone who purchases the Apple Watch Series 3 from Best Buy benefits from free shipping. It could be a good deal for those who don't want to wait until Apple reveals its next smartwatch, but once that's released on the market, you might score a better deal (although not by much).
source: Best Buy