Check into corporate sponsorship programs for the arts. This is a highly competitive field but can mean big bucks if you are successful. Many corporations have tightened their sponsorship budgets, but will add their name to your production if it is impressive enough.
Look for artist groups or coalitions in your area for grants. Many local artist coalitions give small grants and sponsorships for arts projects. For example, the Asheville Area Arts Council gives grants locally.
Seek government grants from the state or federal government. For example, the Ohio Arts Council provides grants to artists of all kinds. The federal government also awards grants through the National Endowment for the Arts.
Read the guidelines carefully for whatever path you choose and write the grant or sponsorship application to those guidelines. The field is so competitive that one mistake may cause your application to be thrown out.