Thera a nice stove on CL for $100 near me. It's cast iron, and has a longitudinal crack across the back. I was thinking of these ways of repairing:
Lighting and keeping a fire going in it so it preheats and cools slowly and then,
Brazing w brass (don't know if that will hold up to the continuous heat)
Welding with Nickel rod, but I'm unsure if this is a tig filler rod or a stick rod.