Cheapest I can find for this, great price from Tesco.
Hit the streets of Hot Wheels with the City Blastin' Rig! Load your cars up and transport them to their destination, then send them flying with the vehicle's built-in, kid-powered launcher. With room for up to 14 Hot Wheels® vehicles, you can take your favourite cars with you wherever they go.
The City Blastin' Rig comes supplied with 3 Hot Wheels die-cast vehicles so the fun starts straight out of the box.