Are you referring to the Turtle Bus 5LM?
http://edushop.edu4kids.com/images//...s/WIN800_L.jpg

If so they stopped making these, pulled off the market a while ago. I know because I looked everywhere to buy one and a supplier in the US advised me.

Or something like this?

http://www.overstock.com/Baby/Go-Go-...5/product.html