I have 3 Deco P9 using powerline backhaul and need to add a fourth to cover the porch/deck.

I could hardwire one of the the existing P9's location to use ethernet for backhaul, replacing it with a new unit and put the existing P9 on the porch.

I can't find where to buy one P9, what should I purchase that you can buy just one unit without spending too much.

Thanks in advance!