K'Nex is huge in our house right now. My son has the dinosaur set and he loves it. He makes up all his own designs though, preferring that to following instructions. And he needs help when he does do one of the models in the manual from mum or dad (he's five). I know he'd love this - maybe not now but definitely in the future so it is something that's worth our while to buy now and put aside for a year. It is the K'Nex Amusement Park Ferris Wheel on sale for half price (£14.99) at Toys R Us
From the comments made over at our sister site HUKD, it would seem that this is an offer that's only available online. Other posters have seen it full price in store. Standard delivery is £4.95. The other sets in the Amusement Park range are also available at half price.
My step daughter was into K'Nex and we got her this when she was 10. And she loved it. So much so that she still has it (and is now 25)! Which means we need to buy another one for her little brother.
When complete the ride stands 1.5 feet tall. It is built with a combination of 478 K'nex rods, connectors and bricks. There's a motor included, which the websites says "provides realistic thrill ride performance".
I speak from experience when I say that this is a lot of fun to build, but it takes time. And you definitely want to start somewhere you can leave the model over time, so you don't have to move it around the house mid-construction.
Thanks to lovebargain at HUKD!