Ive bought my books.
You can buy them on campus at the coop bookshop. You can also order online from their website.
The books and readings you need should eventually be on your ilearn page, but you can also do search on the coop bookshop website for what you may need.
Joining the coop will save you money if buying new. You can also order online and get them delivered or pick up
Every year there is big queues the first few weeks as people but books, so going early saves you the hassle and also stops any chance of them selling our and needing to be ordered in during the first weeks of class.