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You may also try interfaithfamily.com to find a local rabbi that is willing to do an interfaith ceremony, though as the PP said they might not co-officiate though.As for cost, it can be pricey if your sister or fiance isn't using their own rabbi from their shul. We are having our ceremony on a Saturday (after sundown) and it was difficult to find a Rabbi that would do the ceremony at any time on a Saturday. Another thing to consider.