Living Social offers a Radio City Christmas Spectacular Ticket for $50. That's a savings of up to $60 and the best such offer we've ever seen for this NYC holiday classic. You will receive a voucher that can be redeemed for one set in standard orchestra or 1st mezzanine seating. The voucher includes a Rockettini souvenir glass and drink. You can purchase up to four vouchers. Note that this voucher is only valid for select dates and times between November 11 and December 2. Deal ends August 14.
Note that although this is listed under Living Social NYC, it can be purchased by people in other locations.