Applying for z Visa. Can I apply by mail?

Help,
I live in Idaho and apparently I am under the jurisdiction of the Washington DC Consulate. How can I apply for my Z type for my daughter and I. I cannot afford the $700 to fly 6-8 hours to Washington DC to apply in person and I do not know anyone that can help me in person. What are my options? Can I use a consulate that is on the western side of the continent? I have plenty of time, I'm not starting work until August. (5 months)