This is awesome:
Hoogland, Mark-Robin. Thomas Aquinas: The Academic Sermons. The Fathers of the Church, Mediaeval Continuation, vol. 11. Washington, D.C.: The Catholic University of America Press, 2010.

It contains all St. Thomas's academic sermons, even the ones not even published in Latin yet!

Here are the sermons previously published in
• Latin
• bilingual English/Latin

Unlike his sermons on the Our Father, Ten Commandments, Creed, etc., which were were delivered in vernacular Latin (Italian) and translated to Latin, the academic sermons were delivered in Latin.

St. Thomas has two sermons for today feast for Our B.V.M.'s birthday in this work:

17. Lux orta (Birth of Mary)
18. Germinet terra (Birth of Mary)