Hey, the books I have are:
-Research methods and statistics in psychology (5th edition)
-Cognitive psychology (6th edition)
-Cognitive neuroscience (3rd edition)
-Social psychology (4th edition)
-Biopsychology (5th edition)
-Understanding children's development (4th edition)
-Atypical child development in context
-Reconstructing childhood
-Critical psychology (2nd edition)
-What is this thing called science?
I found these all to be really helpful and i've used them all across the 3 years of the course, and about half of them at least are really essential. Speaking as a student who's done the course and has used a couple of old editions of books, it doesn't really matter that much and I feel like I've got good grades thanks to these books! Most of these are fairly new anyway as I bought them during my time here.
For all of these I would be looking for about £100 (excluding delivery) which is about half of what I payed for them all.
Let me know if interested