Most Popular Deal Sites

Check these out

http://www.mysupermarket.com/
http://slickdeals.net/
http://www.fatwallet.com/
http://www.woot.com
http://dealnews.com/
http://www.bradsdeals.com/
http://www.offers.com
http://www.slickadvice.com
http://www.dailysteals.com/
http://retailmenot.com/
http://www.passwird.com/

Retail Stores that Offer Price Adjustments
http://www.kiplinger.com/article/spending/T050-C011-S001-retailers-that-offer-price-adjustments.html