Is the sale of this product authorized by Rosetta Stone? I was informed by a Rosetta Stone rep that they have an authorized store via Amazon and if their product is purchased via Amazon, I could call Rosetta Stone for any technical support - is this true? Also, why is the price substantially cheaper via Amazon then if I were to purchase directly from Rosetta Stone? Does the box include CDs for all 5 levels as well as the Audio Companion and Headphones/ Headsets? Are Tutorials with real instructors also included (I believe version 4 offers this new feature if ordered through Rosetta Stone)? Finally, what is the return policy?