Yeah, no kidding, they are cheap
I thought he was looking for a multimeter, since he said everything he was seeing was 10A, which sounds like the typical DMM. I might have been wrong.
Maybe he could just get a panel-mounted meter, aren't they something like 0-50 microamps? And put some kind of shunt around that. For a hundred amps, maybe a 1-inch piece of copper bar would be about right
