My expert internet searching found that Custom Marine Services out of South Carolina has the Bussmann 120 HI-Amp breakers, part no. 185120F also. They are in-stock and are $42.00 ea. apparently they are also used in boats, the guy was real nice and confused on why so many robotics teams we're ordering 1 ea. of these from him
but I explained it all to him, and he said keep on ordering!!