STUDENTEDG
Just saw it also mentioned here, so not sure if expiry is accurate as it's newly listed on the Student Edge website. (The other 10% off coupon didn't work on a textbook I tried).
Hope it helps save a bit more :)
10% off Books (Including Textbooks) @ The Co-Op Bookshop
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End Date: 07/08/2016 11:59PM as per https://studentedge.com.au/deals/details/co-op-limited-time-…