You can get the 1, 6, 12 and 21 alloys as gas shielded MIG wires, and in some cases open arc or sub arc wires, from Stoody as well. To learn more, check out the product data sheets in the Stoody literature library online:
http://www.thermadyne.com/stdy/literature/nickel-electrodes.asp?div=stdy
Hope this helps.