Can someone please tell me where I can get both discs from the same place for the lowest price possible. Unless you can convince me that I absolutely, positively, will only ever need one or the other, I think I'd like both. Also, a magazine...I believe Sound & Vision? (the one that used to be Stereo Review) mentions a disc of their own called the "tune-up disc" or something like that. Is that worth having at all, and if so, where can I also get this?