Outdoor play toy gift?

I have been looking online for a potential birthday present for my son, he is going to be 3 years old and my mum and dad want to get him something special to play with in the garden..

I have seen a giant sorting tray on amazon by sovereign play? You can fill sections with balls and others with sand like a sand pit, they have other things too on there but i wanted to know if anyone had heard/brought anything from there? I just wanted to make sure it is a good quality product..

I need something that wont be too big as my garden is fairly small and something within the price range of £50-£100 (thats my parents budget but they may go a little over)

His birthday party is 2 weeks from now so this is very urgent now - any suggestions?