BOOKO states some of these books price starts at around $15. Realistically you can find these from time to time for less than $10 at various bookshops and Big W. However $5 is not bad.
Dear Zoo and Other Children Books $5 at Aldi
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I love this sale! Time to stock up on Christmas presents for friend's children. Safe, educational and usually non-objectionable for the parents (Roald Dahl books excluded). Beautiful artwork - and usually even Big W is much dearer on these. The Australian ones are my pick of the crop.