It used to be just a fictitious brand but Homer Simpson's favorite booze is actually sold now in Guadalajara, Mexico and other Latin American countries like Argentina, Colombia and Chile. A certain Rodrigo Contreras got the patent in Mexico for Duff beer and is bottling and distributing the brew. Duff Beer is portrayed in the animated series "The Simpsoms," as a parody of the stereotypical commercial beer: moderately priced, average-quality, and advertised everywhere.
It is not clear if Contrera's patent will shield him from lawsuits from the show's producers since Fox has never licensed the beverage in the United States or anywhere else.
According to several reports, Simpsons’ creator Matt Groening fears that bringing Duff into the real world would be tantamount to pushing alcohol on minors.
A bottle of the real Duff beer is reported to cost $5.50.