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About $50 each. Not bad, really, unless you're trying to get the whole set. For some of the programs, you're supposed to do the entire set in order, progressing from one to the next. Therapy offices usually buy these, because they're more intense and thus more effective. With others, though, all of the discs pretty much serve the same purpose, the only reason you'd want more than one is to mix it up and not let your kid (or their brain) get too used to one exact set of sounds. They say you can help drag it out by putting the tracks on random, plus we have a little visualization app on our DVR that will randomly select different themes and patterns each time a song comes up, so I think one or two discs will go pretty far for us. Plus, you're only supposed to listen for a maximum of 30 minutes at a time, and some parents say their kid gets awfully fidgety after about 15 anyway.
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