What are some alternatives?
When comparing Cartercoupons.com and Panda Cash Back, you can also consider the following products
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
ebates - Find thousands of coupons, promo codes and discounts.
Dealspotr - Dealspotr is like Wikipedia for deals.
ibotta - Earn cashback by shopping at your favorite stores
CouponNDeal - I regularly checking this out now.