Unfortunately for most arrangements the absolute minimum quantity of copies which can be purchased is 15.  This is simply to ensure we are able to cover our costs of licensing, set up and management of the website.  It is not possible to offer a combination of 15 licences for learning tracks but only 1 licence for the score for example.    We have tried to price all arrangements available on the site so that this is not prohibitive however – a purchase of 15 copies of sheet music and learning tracks for most arrangements costs £10.50.