None of this would be possible, of course, without the books. Here are some book shops I have used and recommend. None of them has paid for appearing on this page.
John Thornton
455 Fulham Road, London , SW10 9UZ
020 7352 8810
One of the last few good bookshops in London (there used to be many more).
Thornton specialises in philosophy and theology (mostly the latter),
and has many old and interesting Latin books.
There is still half of the Summa Theologiae from the Clerical and Sowter library in Salisbury
mouldering in the basement (and the basement is worth a visit in its own right).
Herb Tandree Philosophy Books
Fromehall Mill, Blk 2, Rm 9, Lodgemore Lane,
Stroud, Gloucestershire, GL5 3EH, UK.
Email: herb AT philosophy-books.co.uk
Herb has over 7500 titles in Western philosophy,
with large sections on the Philosophy and History of Science, and Logic.
I've bought a lot of stuff from Herb, indeed he even sends me a Christmas card.
Abe Books
Here a
search
on incunabula yields a splendid collection of old latin books,
some of which are featured here in the Logic Museum.
Sadly they are very expensive, e.g. Ratdolt's edition of the Elements, 1482 is yours for a mere £222.514.95.