Book collection to split up for party bags

[TimeForMy10thCuppa]

Can anyone suggest a collection of books i can split up for party bags? I need about 20 books. LOs range from 3-7 years. As cheap as possible. Thanks in advance.

I would look for non fiction. I used to do horrible histories or horrible science though that might be a bit on the old side for the wee ones.

WHatever the book people have 10 for £10

"I wonder why?" collection from the Book People could be good. Or 2 different smaller packs, one for younger children and one for older children.

I've just bought the Dr Seuss book collection from The Book People for this reason. Alternatively, The Works do 5 books for £5 pick n mix.

This is a collection of 20 Dr Seuss books www.thebookpeople.co.uk/webapp/wcs/stores/servlet/qs_product_tbp?productId=771838&catalogId=10051&catId=128706
Or this collection of 10 doodle books www.thebookpeople.co.uk/webapp/wcs/stores/servlet/qs_product_tbp?productId=770279&catalogId=10051&catId=128706&pageNumber=4
A collection of 20 'I wonder why' non fiction books www.thebookpeople.co.uk/webapp/wcs/stores/servlet/qs_product_tbp?productId=657925&catalogId=10051&catId=128706&pageNumber=5

Thank you for all the replies. I ended up going with the works and buying 30books. Enough for the party guests and some christmas ones to refresh their book advent calendar. Thanks again.