Hi Nasser: You might want to try Pyramid Products Co, 85357 American
Canal Road, Niland, Califlornia 92257. (760) 354-4265. These units
operate on natural gas, propane or butane.
Pyramid manufactures gas-fired melting furnaces in the $400-$700
range (approx.). The company also sells all the odds and ends you need
for working with these kinds of melts, such as pyrometers, pick-up
tongs, high-volume regulators, etc.
They also have a small catalog, but I don’t remember how much it is.
(But it’s only a very few dollars).
Hope this helps.
Oakville, Ontario, Canada