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Aftermarket like smoke daddy could be cheaper.Watch the crack, if it travels take it to a welding shop. Ask them to vee it out and weld it with nickel rod and to peen the weld with a needle scaler to relieve weld stress.
If that happens, drill a hole at the end of the crack. It will stop the crack from spreading.If the OP gets a replacement he should save the cracked one in case the new one cracks.