I found a Scrabble Junior jigsaw puzzle in a charity shop for 99p.
I'd not seen this version of Scrabble before. It's a great puzzle with many levels of engagement. Firstly there's the jigsaw puzzle, which forms the board. Next there are missing letters within the words and tiles to complete them. Then there are questions on the box, like 'Find the pairs which go together.' King matches queen and so on.
We've already had 99p worth of value and I think it will keep the younger two interested for a while.