Asda have some great deals on wooden play centres right now, and this hugely popular Plum Tamarin Wooden Play Centre is a bargain at £150. This very same set is on offer at Argos for £299.99 so this is half their 'special offer' price!
This is a sturdy wooden frame with a slide and two swings so several children can play at once. The slide has a climbing frame ladder leading up to a play deck and a way slide, and that enclosed wooden area under the deck could even be used as a sandpit I think, as long as there's no one on the swing next to it.It's made from FSC certified wood and is treated to protect it, and you get anchors to secure the frame into the ground.
It says that it's suitable for children aged from 3 to 10 years so you should get a good amount of use from this set, and the reviews are great as well.
It's not available for free click and collect due to it's size, but home delivery only costs £2.95 so that means it's still a brilliant price.