Need 12 volt ac to 24 volt ac transformer

Hi I need to convert 12 volts ac to 24 volts ac for an outdoor
lighting project low amperage, say 500 ma. I am looking for a small
boosting transformer on the cheap. Any suggestions on where I can find
something like this? Alternately I could use a cheap 12 volt ac to 24
volt dc converter. Google has turned up endless garbage for me.

Thanks

.

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