I found this today instore at Hermiston Gait Tesco, down from £29.99 to £7.47, plenty left there, unsure if it's nationwide though.
Fun 3-in-1 vehicle playset with missile launcher accessory
Catapult figure launcher converts from a 4x4 to a jet to a command center
For your Super Hero Squad figures (each sold separately)
Playset comes with Wolverine figure and motorcycle vehicle
Always keep the good guys one step ahead of the villains with this mighty and mobile three-in-one crime-fighting headquarters