ITA Matrix is pretty good too. http://matrix.itasoftware.com/ http://matrix.itasoftware.com/ Plus, if you know your way around fare codes (http://www.farecompa

ITA Matrix is pretty good too. http://matrix.itasoftware.com/ http://matrix.itasoftware.com/ Plus, if you know your way around fare codes (http://www.farecompare.com/products/fare-display/index.html http://www.farecompare.com/products/fare-display/index.html) you can find dates with Matrix where these "cheap, special" fares are available, using the advanced options.