There is certainly no limit to how many different ways money can be spent on the education of children. In reality, it is neither difficult nor expensive to educate children. Thus, at no cost beyond a contribution to the library, whether voluntary or tax based, students can avail themselves of all that they need to gain a solid working knowledge of history. Most important, though, in the home school students learn how to learn and where to find information. A formal school setting requires more organization and setup, more space and supplies, but it is not the sophistication of the materials or the cost of the facility that creates education.
Education occurs in the interface between mind and experience, and there are many means to that end.
It immediately becomes clear that the big costs of public schools are not in the learning materials themselves but in the maintenance and building of physical plants, in the salaries of teachers and support staff, and in the huge bureaucracy that administers all these layers. In fact, with the rise of mass education, as the number of students has increased, the number of teachers has increased less dramatically than the number of administrators. Thus, the ineffective education dollar has to cover a good deal more than the process of teaching children. The reality is that the magnitude of the project is what costs money, not the process of education itself. It takes more than money to produce education.