If you love Technic and have a Smyths near you then it could well be worth your while checking them out. I found this set marked down from £60 to £21 in the Charlton branch. There was several on the shelf and when they rang it through it actually came up as £19.99.
An absolute bargain, you get a motor, power box and piston with this one and the truck is quite substantial.
Not available on their website, it could just be luck of the draw but worth a look. :)