My Poundland has had a load of different sets in. Last year I managed to get the complete set of the large books think their was something like 20+ to collect. They have also just started getting the Mr Men Celebration series books in as well as the magic ones.
the pound shop ones are quite a bit larger if they are the same as the one I got. about 4 times the size.
This might be a better deal if you plan to have a few of them https://www.theworks.co.uk/p/childrens-collections/mr-men-box-set---my-complete-collection/9781405274050
Love these books. Thanks for posting, heat.