I would highly recommend looking at the reading list. I would also say the library is your best friend.
We were told at uni (I went back for the 23-24 academic year to do my Masters), having graduated 5 years prior (Biomedical Science) that having paid our tuition fees, all books and software packages needed would be provided for by the library and so didn’t need to spend money (this was at UWE).
Look at the reading list and see if you can borrow an e-book from the library (personally I’m a little old fashioned and took physical books where I could but that’s because I always need to do something with my hands when revising).
Either that or ask your course leader if they can recommend anything.
Also, try and see if you can find any second hand books online as old uni students who graduated may sell them MUCH cheaper than buying new (I bought a full set of books for £20 in my BSc when new books were going for maybe £80 each…).
I also don’t know if this is the same everywhere but UWE was tending to stray away from physical books (I even offered to donate my old books I.e my anatomy and physiology books) to the library but they turned me down as physical books just took up too much space.
Good luck!