Plugging in an oscilloscope in a land of non-grounded outlets
Obviously the problem is only going to be if you are using the oscilloscope to probe a circuit that is directly connected to the mains.  I would use an isolation transformer, like this one, to isolate the mains voltage from the circuit under test.

Because there is no conductive connection between either of the wires of the transformer secondary and ground, there is no danger touching a live part of the circuit.