What RX options are available for someone on a budget with depression/anxiety living in Omaha, NE, USA?

I am a resident of Omaha, Nebraska, in the United States of America and have been diagnosed with a broad array of mental illnesses. While the details of many of the diagnoses have been contradictory, depression and anxiety are common themes. Frankly, my idealistic concerns about tinkering with my brain chemistry are outweighed by the practical necessity of not being a basket-case shut-in. What options, if any, are available for someone of limited means who is finally willing to try a prescription solution?