Adriano Oliva, OP, kindly sent me two PDFs that provide a list of all Leonine volumes now  available from Éditions du Cerf, ranging from classics such as Thomas's commentary on the Ethics of Aristotle, to the newly-released volume containing his sermons. The PDFs contain descriptions of each volume, its price in Euros, and its thirteen-digit ISBN number. Of course all the needed contact and ordering information can be found, too.

Grab a PDF—one is in English (here), while the other is in French (here)— and send it to your library's purchasing agent! The Leonine is, after all, the pearl of great price.