I haven't spent any money on books yet, but I am planning on doing so this year.
Although I've spent a small fortune in printing out stuff, lecture notes etc
It really depends on your specific course. Doing languages at St Andrews I bought 4-5 books per semester (2 semesters in a year) which ranged from £4 to £15 each. I know people doing languages elsewhere can spend much more.
Also, people doing other subjects at my uni can spend any amount of money - Biology students had to get a 'pack' of stuff for about £90 one semester, and one IR textbook cost about £25.
I think it's ok to get books from the library that you're going to use once, maybe twice, but anything that you actually need for class/lectures (e.g. literature texts for languages) I'd recommend buying. Also if you wait until after the first week, and ask second years etc, you can find out which books you actually need to buy. Try searching around charity shops/looking at noticeboards in your hall/union because second years may be selling them on at cheaper prices than the local bookshop!
I didn't spend any money; London has many large libraries and the British Library is within walking distance from my house, so I have no reason to spend money on books.
If you don't live in London, you'll probably have to fork out.
I spent about £200 in my first semester.
I now borrow the reading material from the library and I'd advise anyone starting uni this September to do the same thing.
Its worth checking the library first before parting with your cash. If the library doesn't have a limit on the number of time you can renew a book there's no reason you can't just keep it in your room and renew it on the internet every week/fortnight.
If you do have to buy a book make sure you order it off Amazon (2nd hand if possible) rather than getting ripped off at Waterstones or your uni shop.
I spent less than £50 on books during my 3 years at uni.
originally i used to buy all of my books, but then by the second and third year i took to only buying books if the course was literally built around it, otherwise i would check for library availability first.
In my first year of English Lit I bought 3 or 4 novels a term maybe, and anything else I'd get from the library. So like, £40 a term?