This type of approach seems to beg for collaboration between schools. If something like this can be done for such a fraction of the normal price, what's stoppin

This type of approach seems to beg for collaboration between schools. If something like this can be done for such a fraction of the normal price, what's stopping a school from molding this existing text to their own curriculum or building their own book from a repository of texts and other existing "open-source" books? Then they could allocate spending elsewhere.