I'd consider seeking out German-American friendship clubs and/or high school German teachers and college professors. They could probably point you in a few lower-cost directions.

A couple of links for you...

German Learning Opportunities Website

The German-American Community Project, Inc. founded / supported by the German-American community of New York, the German Consulate General, the Goethe Institute, major German cultural institutions and a growing number of corporations, groups and people.

Viel Glück!