On September 6, 2018, Amazon.com added another Pro Trek Smart WSD-F20A listing being sold by Amazon. The model number is WSD-F20A-BVR which we have not seen before but according to the photos it appears to be the same watch as the WSD-F20A-BUAAU in the first listing.
It may be worth keeping an eye on this new listing if you’re thinking about buying a WSD-F20A. The WSD-F20A has all the same technical features as the more expensive WSD-F20. The difference is that the WSD-F20A has a resin buckle instead of a stainless steel one and smooth, non-textured buttons.
Casio is releasing the next-generation Pro Trek Smart WSD-F30 in January 2019, so it might be worth taking a pass on the WSD-F20A for now to wait for further possible discounts on the whole WSD-F20 lineup.