Best price on Google is $399
eBay is offering the Apple Watch Series 4 GPS 40mm Gold Case with Pink Sand Sport Band MU682LL/A for the best deal.
Next best price on Google is $399 Shipped
40mm Price is $289 Shipped
This is open box, but is LIKE-New and comes with a year warranty! They even allow 30 day free return if you don't like it