We have all asked this ourselves a million times before we arrived in HK. However, books will never be a problem, you will have an opportunity to buy them new, old, ancient, used, highlighted with notes, without notes, with missing pages, everything is possible here:
1. New: Buy them new from Oxford Bookshop at 4527 Masarykovo Namesti, Hradec Kralove 500 02 or from amazon.de or .co.uk
2. Used: You can find books sold by students who have finished your subjects here or at one of the physical bazaars organised by ISU in the beginning of October.
3. Borrowing: You can borrow all the books you need, albeit not the newest versions, from the medical library against a refundable deposit of 10 000 Kč (€400 or £350).
It is, however, strongly strongly suggested that you buy them only once you arrive in HK so that you know what books you really need.