I need to shield my device from magnetic interference, including earth magnetic field (if you move device around, it might be enough to cause slight currents i guess) and magnetic field caused by power nets, wires with large currents e.t.c .

I know this could be achieved by making case out of mu-metal, but it seems that I can't find it anywhere (especially in small quantities).

So, are the other, easier ways to shield magnetic field? Will multiple sheets of steel work for example?

I need to shield my device from magnetic interference, including earth magnetic field (if you move device around, it might be enough to cause slight currents i guess) and magnetic field caused by power nets, wires with large currents e.t.c .

I know this could be achieved by making case out of mu-metal, but it seems that I can't find it anywhere (especially in small quantities).

So, are the other, easier ways to shield magnetic field? Will multiple sheets of steel work for example?