MasterCard announced today that it would be expanding its Overwhelming Offers program on its online shopping portal, MasterCard MarketPlace. Every day from now through December 24, 2010, excluding Thanksgiving, MasterCard will launch offers at 1pm EST providing cardholders the opportunity to earn savings of 50% or more off on purchases from brand-name merchants such as Barnes & Nobles or Toys “R” Us. For instance, today’s deal offers a $50 statement credit for making a purchase of at least $100 at PETCO. Deals are offered on a first-come first-basis, are limited in quantity and registration on MasterCard’s site is required.

For more details or to see current and past deals offered, see www.mastercardmarketplace.com.