Raspberry Pi's for Computer Science

We are a small school district with limited funding and approximately 70% of our student body is comprised of free or reduced lunch. We are trying to build a computer science program in our school. In order to increase interest we are looking at ways to increase project based learning on a small budget. One way to do this is by using Raspberry Pi's. They are approximately $70 each but are worth significantly more in terms of education. A 21st Century education for our students begins with an interest and grows with the ability to experience it firsthand. Being able to learn and experience what technology can do through one's own exploration is much more powerful in sparking interest and growing it than learning through someone else's perspective.