Well, dang. Try Sears. Or the manufacturer of the appliance.
I know what I’d do, but that’s me.
I’d get a replacement wall jack to match the plug-in on the appliance. Turn off the power to the circuit; make sure it’s off and that no one can turn it on again; and replace the outlet.
But that’s me. Alternatively, you could have the power cord replaced. (Of course, I’d do that myself.) — (I do everything myself.)