I got a Vision Kamado about 2 weeks ago and grilles some steaks.Foe smokingI realized I would need a diffuser. Vision sells one that is available at Hime Depot
this unit has a bracket that places the stone below the grate so both grates can still be used for smoking. I checked at the local HD and this is only available on line
while I was there, I saw this for $13
Ialso picked up a 14" teracotta pot base for $9 and a couple of 1/2" non galvanized steel bars to make a bracket.
I tried it with some ABTs with good results.
the brackets put the plate 4" below the grate.
$9 for the plate and $6 for the steel is a lot better than $50 for their stone.