Commencing November 20, Sam's Club will be offering the Garmin Fenix 5 Plus Smartwatch for $329. On-line and In-Club (where available). Limit 2. Free shipping for Plus members, nominal shipping for regular members. I believe this would be an all time low price for this watch, although they have introduced a newer higher price point model.
To address the inevitable...
Yes the site shows as out of stock now...but it does appear in their upcoming holiday catalog with a sale start date of November 20.
Most likely non-members can purchase with a trial membership (free) or with a small surcharge.