The Gainesville Sun:  “The cost of policing the Dove World Outreach Center for the planned Quran burning that never happened is expected to come to about $100,000 each for the Gainesville Police Department and the Alachua County Sheriff’s Office, officials say.”

See also “Planning to Burn a Koran = $200,000 Bill from the Government for Policing Costs?”  The article by UCLA law professor Eugene Volokh says,

“Except that charging people money for extra policing, because of a fear that thugs would react violently to their speech, is unconstitutional, see Forsyth County v. Nationalist Movement (1992).”