@ Chuckl - I bought the vision stone from Home Depot for I think $49. Works great and sits lower than the lip. I've only had it 2 mths and the metal bracket does show some rust but that area gets super heated. For pizzas, I leave lava stone on deflector in bottom and do a 2ns stone up on 2nd tier of rack. Works great....
Vision Classic Kamado, Vision Classic Kamado Kub, UDS, Weber Summit Platinum D6, Weber Performer, & Weber Smokey Joe