Cashbackholic

Cannot rely on it for 100% accuracy, but is a good place to start and covers most of the large retailers you are likely to use.

Many CB sites have rates set by categories. This site will usually present the highest rate, which is likely not relevant to you (as those higher CB rates are rather restrictive). Essentially, you must click through and read the CB sites' own description of the retailers to know.

Their ratings of CB sites are fairly accurate - maybe too optimistic for some, while slightly too pessimistic for the best ones, based on our experience.