Item code is BGESP
They have them on Amazon and often on EBay.
I bought these in an Ace Hardware store that has a pretty well stocked BBQ section (green egg dealer)
Blackstone 2-Burner, Primo Oval XL, Tiernan SOB,
The Pit Barrel Cooker, Big Green Egg-Mini, 4 Webers, Lodge Sportsman, Cobb Cooker