Penny for Your Thoughts? Quad Cities is the 4th Cheapest Place to Live in U.S.Penny for Your Thoughts? Quad Cities is the 4th Cheapest Place to Live in U.S.U.S. News, which recently named the QC as one of the best places to live in the U.S., ranks us as the 4th most affordable place to live in the country.Sarah StringerSarah Stringer