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If you have a scrap yard around and don't mind building your own case you can use control power transformers out of old switch boards.
Most scrap yards are HAPPY to get rid of transformers as it is a pain to burn the insulation to strip the copper from the core.
Almost all switchboard transformers have a KVA rating on the voltage plate. A 440 / 220 primary hooked 220 with a 120 / 220 secondary hooked 220. Operate at 120 / 120. You will be limited to 1/2 the KVA rating for current on 120 because of wire size. Heavy, but cheap. If you have a 220 outlet then the 220 / 120 gives you full current.
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