Best sources for shopping coupon codes, price comparisons and real time sale announcements

The internet is filled with sources that claim to have up to the minute coupon codes, price comparisons and sale announcements.  However, most of these sites are simply affiliates advertising for specific companies.  The following sites are community run and are true sources of great deals and coupon codes.  Check them out, most are updated minute by minute:

http://www.pricewatch.com

http://www.dealhack.com

http://www.slickdeals.org