In Mexico one can say "Gratis, hasta las puñaladas" (if it's free, one can even take a stab) o "A quién le dan pan, que llore" (who would cry if given bread). The second one is more general to a situation in which a person is offered a good thing or a good opportunity without having asked for it.
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♪ ♫ ♪ Ain't it wonderful to be alive when the Rock'n'Roll plays... ♪ ♫ ♪
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