About any hardware store, big box store or northern tools, that handle keroseen / diesel heaters, can get the MiTM - Val6 knock off - you need to ask for them to order one for you . . .. Northern tools has their own version, which is a bit cheaper (constrution/materials) then the MiTM ~
Here is the parrent company that markets them ~ http://www.pinnacleint.com/products.html
http://www.mitm.com/
http://www.northerntool.com/shop/tools/product_200395538_200395538
and another new comer - http://www.v40heater.com/