The foundation I work for is looking for new clients. Can you think of potentials? [Details inside].

We are a foundation that works solely with volunteers, and the goal is to give people that are unfit for work, unemployed and people with psychiatric problems, a daytime activity, in the meantime making quality furniture for a reasonable price.
We produce wooden furniture, mainly for primary schools and Kindergartens.
Last week I have send mailings (per post) to dozens of primary schools, but I am sure that there must be other institutions that we can send brochures to that we just overlook.
Do you have an idea as to who we can mail our flyer to?
Thanks in advance!