I recently came across an interesting, French-language web site called Calvinisme, that has some helpful resources.
(link to index page for Turretin)
Gerrit Keizer biography of Turretin, "François Turrettini, Sa Vie et Ses Oeuvres, et la Consensus"
Sermon 1 by Turretin, "Le Bonheur du Peuple de Dieu"
Sermon 111 by Turretin, "Le Réveil et la Résurrection du Pécheur"
I hope that perhaps the owner of the web site may scan some additional sermons of Turretin into PDF form, so that the world may benefit.