You might consider Grove City, PA and Trinity in Hartford. Grove City has an explicitly Austrian program - perhaps not great for grad school admissions, but a solid Austrian education. Trinity now has three Austrians on faculty. San Jose State College in CA could also be a good choice, as could Suffolk University in Boston, which is actively seeking Austrian grad students.
As for volunteering, at Trinity there is a free-market think tank located on the campus, and the Connecticut LP could always use some help.