Ah ok.. You just want the latest and greatest "Shiny and New" Amphibian..lol. Well lots out there.. including freeware IE: previously mentioned two updated FlightPort Cessna 206s that work in FSX through P3Dv4.3:
FlightPort Cessna U206G Soloy Mark 1 FSX & P3D Version 4.0
and
Cessna T206H Soloy Turbine Pac Mark 2 FSX & P3D Version 1.0
https://www.rikoooo.com/downloads/viewdownload/57/886https://www.rikoooo.com/downloads/viewdownload/57/885But you can find these (and piles of other aircraft) at most freeware sites: Simouthouse, Simvation, AVSIM, FlightSim.com etc that work great in P3D (as well as FSX)
Pays:
Well MV-DHC2, MV-DHC3, MV-DHC3 Turbine, (Justflight also has a DHC3-Otter),
that work in P3Dv4x.
Carenado have updated almost all of their aircraft now for P3Dv4x. (But not too many that are float/Amph versions and turbine).
Pick what you want to try and search from various creators to see what might best for you for the $$.
Here is a list that might help: (Seaplanes and Amphibious aircraft lists by County):
https://en.wikipedia.org/wiki/List_of_seaplanes_and_amphibious_aircraft *Use the listing of aircraft for Canada or United States which cover just about all you might ever need).