Here is another kit that can turn any gas grill into a pizza oven. The only fire Pizza Oven Kit has a stainless steel chamber, 14″ pizza stone, and 13.5″*16″ aluminum pizza peel. You can use this on top gas grill brands like Weber and Broil King.
You can assemble and install this pizza oven kit in minutes. It has a temperature gauge too. It costs under $150 at this time.