What are some alternatives?
When comparing ChameleonJohn and Cartercoupons.com, 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.
Dealspotr - Dealspotr is like Wikipedia for deals.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Groupon - Each day Groupon offers a deal through local vendors in your city.
CouponNDeal - I regularly checking this out now.