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I live on E. 29th St. and it costs $37+tolls/tip from Newark. Greenwich Village should be about the same, give or take a couple dollars. The fare is regulated, and you're told the price before you get into a cab.
Keep in mind that you'll have to pay ROUND-TRIP tolls, since Jersey cabs aren't allowed to pick up a return fare in Manhattan. Your total will end up being in the neighborhood of $50.