Car Ramp Racer?

I'm after a car ramp racer (not sure exactly what they are called!!)

My brother had one when we were little, and I really want to get one for Coop but can't seem to find one anywhere.

So, can anyone help?

They are normally made from wood and have a ramp going down which a car goes on, then "falls" to the next ramp etc

I have my fingers crossed that someone will know what I'm going on about and that this post just doesn't fade into nothing