How do Federal Reserve banks get their money?

The Federal Reserve Bank doesn't get their money from anyone; they're the central bank for the United States of America. They watch our GDP, or Gross Domestic Product, which is the measure of growth in our economy, and supplies money to satisfy that level of growth. One of the FRB's jobs is to regulate the quantity of money in our economy to avoid inflation and deflation.

Bills are printed by the Bureau of Engraving and Printing at the request of the FRB, and are distributed to the banking system via the 12 different regional Federal Reserve banks around the US. In conjunction with the BEP the FRB also shreds old money after it has cycled through the system a certain number of times. Millions of old dollars are shredded by the FRB every day.

I'd like to just add in here, that the Federal Reserve is not Federal at all. It isn't even a part of our government and is not subject to U.S laws. It is a private bank that was given it's power through the 1913 Federal Reserve Act, and the 'law' was not legally ratified. The Federal Reserve was the cause of the Depression and all, including current, inflation and loss of value in the U.S dollar.