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Eccentric Miniatures sells sprues of plastic kite/heater shields:

http://eccentricminiatures.com/sprues.html

Other historical minis sellers can do you any kind of historical shield you might want, in metal. There are some who sell decals for shields 'n' things too, as a speciality or a sideline. I'd be surprised if there weren't some fleurs-de-li or heraldic eagles among them.