Where Can I File 2011 Taxes Online For Free?

I didn't file my taxes in 2011. I would like to file them for free if possible. Or if there is a local resource I could use in St. Louis, MO 63038.
Update: Or any general advise on what to do would be great. I make around 49K and didn't take more then 1k in federal or state, so I know I am screwed.
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