Amazon has Apple Watch Series 4 (GPS, 44mm) – Silver Aluminium Case with White Sport Band for sale at $ 414.99. Normal retail price from Apple.com is $ 429 for this model.
Edit: If you use your Discover Card to pay, you can get 5% cashback on Amazon this quarter. That would bring the final pretax price to $ 414.99 – $ 20 = $ 394.99. Shipping free with Prime.