I have a 2 device Deco X80 and would like to add a third device to extend the range and make some parts of my house more reliable. I'm a bit confused about what I need to buy. I'm unable to find a single X80 to purchase new in a shop (Officeworks, JB Hi Fi, Amazon) as they all seem to be X80-5G (usually in the 2-3 packs). I see Amazon and Officeworks have X50 singles for sale, but I understand these have lower bandwidth than the X80 and not totally sure they are compatible.

Deco Mesh networks are advertised as expandable when you need, but honestly it feels pretty impossible to easily extend it like its advertised.

Can you please provide me some info on where I can get another X80 and confirm if the X50 (or any other Deco device thats compatible) is ok to use.