I remember those too when I was a kid back in Spain. :) Ah! you can still buy them; here's one you can fold: https://www.google.com/search?q=carro+dela+compra+

I remember those too when I was a kid back in Spain. :) Ah! you can still buy them; here's one you can fold: https://www.google.com/search?q=carro+dela+compra+con+tres+ruedas&client=firefox-b-1-ab&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjgiqO2_b3fAhWKTt8KHYGODy8Q_AUIDygC&biw=1920&bih=954#imgrc=AvNQgpll-ZgzjM https://www.google.com/search?q=carro+dela+compra+con+tres+r...: