Where to buy fictional books in spanish? UK based

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my dd has asked for some books in spanish to help with her learning like jacquline wilson or similar, any recommendations of where we can get them?

On amazon they are around £10 per book and I'm wondering if i can get them cheaper else where

www.spanishbookshop.co.uk/

I am a Spanish teacher and I buy the books from this website.
www.little-linguist.co.uk/spanish-childrens-novels.html
Otherwise, in Facebook market, you could find used books at reasonable price.