Edexcel A level textbooks: Biology, Maths, Further Maths (Shoreham-by-Sea BN43)

My 6th former needs the textbooks for these subjects, and I'm reeling at the number of books and the cost of them!
Does anyone have current versions of any of these that they no longer need?
It would also be helpful if anyone can signpost me to anywhere I could buy them second hand.
Many thanks.
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