The majority (80%) of emails sent with coupons received higher open rates and transaction rates than non-coupon campaigns, according to a new report from Experian Marketing Services.

Seventy percent of coupons-using households get their coupons from newspapers. However, the Internet is a growing coupon resource. Over the last three years, the number of households that get their coupons online has increased by 46 percent.

Ebates, a site that many big-name brands offer rebates and coupons through, released its online retail report for August, finding that online sales through the site grew 57% during the month, compared to the same time period a year ago.

The categories that showed the biggest growth were: department stores, baby % kids, books & magazines, apparel & shoes, and health & beauty. In fact, only one category covered by Ebates showed decline – home décor.