Well its not exactly a "product" but it has increased my IQ by about 30 points in the course of 2 years. Its called mathematics, and i dont meant the type of excercises you find in traditional textbooks. I mean competetive mathematics texts, i can promise a 98%+ score on GRE analytical and quantative sections(logic/games scores on LSAT will also be raised) to anyone who completes the following 2 books (doing all the problems, understanding at least 80% of the solutions). These are just examples of texts, more can be found on the AMC (american mathematical competetion website), do a search on google.
Challenging Problems in Algebra by Charles K Salkind, Alfred S. Posamentier
Challenging Problems in Geometry by Charles K Salkind, Alfred S. Posamentier
combined price < $20
p.s.- IQ scores should be raised but perhaps not as dramatically as mine, since i was subject to a serious of emotional and physical illnesses in my youth (working under my production possibility curve for the economics enthuisast).
p.p.s- Only High School Math is needed, but the level of creativity required can not be scaled by grade level.