I bought mine for here. http://www.sangkung.com/itemdesc.asp?CartId=4721297ACCWAREFNJMX429&ic=KECABJ001&cc=&tpc=
You have to call and order over the phone. They had them in stock in New York. There is no orifice needed. I use a LP regulator which is .4psi If i remember right w/ gas ball...