I am so glad that this offer is back on, as this is just the thing to keep my kids happy when it rains this half term. Amazon have 4 for £10 on children's Activity and Sticker books, and as the free delivery spending threshold on books is still £10 there's no P&P to add either.
There are nearly 400 books to choose from, and if you sort them from high to low price you can see that there are big bumper activity books that are £9.99 (even one for £11.59) so you can get your kids nearly £40 worth of fun for a tenner! That's what I did last time, and my eldest is still working through his from Easter as they are so massive.
Don't worry that the discount doesn't show up straight away - it won't show up until you click "proceed to checkout", then it will change to £10 if you have four of the qualifying books from the link in your basket.
You don't have to choose from those £9.99 big books of course, and the most popular ones are Airports, Holidays, Beaches and things like that which are brilliant for occupying the kids while you are travelling (or waiting to travel) on your hols.
There are lots of character activity books as well, with titles from Frozen, Minions, Thomas and more. There are also lots that are more educational, like Tell The Time, and Starting School. Then of course there are many that are favourites of so many kids like Pirates, Princesses, Dinosaurs, Vehicles, Pets and so on. With such a big choice you are bound to find something suitable.
Some of these sold really fast the last time the offer was on, so be quick if you want to grab those massive £9.99 books, as they went first.