The frequency doesn't matter much. None of the adapters translate the frequency but since the power to the device is really DC anyway there should not be a problem. 50 Hz generates a bit more heat that 60 Hz devices so if the power adapter was only rated for 60 Hz it could overheat on 50 Hz power but the reverse is no problem.
$60 should be a pretty advanced power adapter for that price. You really just need to meet the specs with an adapter with the correct connector. The connector can be trough part. Check Radio Shack if have one.
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