When I was selling an English language edition of the Summa (or attempting to at any rate) to try to help fundraise toward some missals (a still ongoing task!), I was asked by a number of people if I had a Latin edition of the Summa available for sale. At the time, the answer was no.
However, I do now have a complete 3 volume, paperback edition (the Marietti edition) of St. Thomas' Summa Theologiae in Latin available. The text is clean and the set is in good shape. Retail value for such a set is around $125 USD-$150 USD plus shipping.
I also have a spare copy of "The Royal Patronage of the Liturgy in Frankish Gaul" by the Henry Bradshaw Society. Cloth hardcover with nice crest on the front. Given a good review by Alcuin Reid and one forthcoming here at some point. Retails at $65 USD, would like $40.
Please email me if you're interested and we can discuss.