I filed my naturalization papers ten days ago (N-400). The online USCIS Guide (http://www.uscis.gov/graphics/services/natz/English.pdf) on page 59 gives Form M-479: Current Naturalization Fees. Amount quoted is $320 + $70 = $390. My application was returned today from the Texas Service Center with a note that the total fee is now $330 + $70 = $400 and a request that I file again with the correct amount. So much for the USCIS site being current. My naiveté I guess !!!!!