Do you mean a baby record book or baby books on having a baby etc.? If Baby books then second hand shops are great - Fara Kids and marketplace and world of books.
Tkmaxx!! I get all my babies books from there, they’re around £4 each
My Aldi's middle aisle had the crinkly baby books this weekend for £1.99
Facebook marketplace! X
I’ve been looking on world of books, lots of good prices and they tend to have bulk buy deals too.