I consider Abbeys as one of the best technical book stores, it has loads of books which may not nessarily be there in e.g. Dymocks. Great staff, feels like they are all librarians, for me, I think their books are everywhere, doesn't seem to find the pattern to look for the ones I want, their staff has helped me to pick the ones in matter of a few seconds. My recommendation would be, if you find any book online but do not exist in Dymocks across the station, come to Abbeys, 90% change you will find them here. Cost wise, it's the same as Dymocks, so I would enjoy it rather than waiting for the stocks to arrive in days. Highly recommended.