I have a chance to be in Rome next week and was wondering if there were any bookstores that would have books in Latin, similar to an OCT, new or used books would be fine, that I could get inexpensively. In the US we have very limited bookstores with books in Latin, reasonably priced.
I found both volumes of LLPSI in a catholic bookshop near the Vatican. In the Vatican itself, there are some religious books in latin, if you are interested in religion, though they are quite expensive. I don’t know about other bookshops.