RetailMeNot had 1.1 million visitors, up 57% from a year ago; CouponCabin had 400,000 visitors, up 65% from a year ago;
BradsDeals.com said traffic was up 174%, to 16,000 visitors per hour.
"Any merchant without an aggressive coupon strategy is at a clear disadvantage," says Loren Bendele, CEO of Savings.com, which works with more than 4,000 major retailers, including Apple, Gap and Home Depot.