It's the same thing earning UR points at the Chase UR mall. They don't allow coupons when using the UR Shopping Portal. Just Google the prices, compare with the UR mall. Sometimes the UR Mall is cheaper, or only slightly more expensive, and I go with them. Sometimes a Google search yields a significantly cheaper price.

Just use your head and read the fine print. Reading and knowing the terms of these things is absolutely vital. Sounds like you may have learned that lesson here so hopefully you won't repeat the mistake.