Questions about LEGO Monster Truck

We would like to order this monster truck, but unfortunately the minimum order quantity is 2 pieces. Why is that?

Why does GALAXUS simply cancel the paid order here and then refers to the fact that a third party supplier has cancelled it, and when I look on their homepage, the item is available exactly from this supplier? A mess, not even an email that the order has been cancelled, no nothing. And then they hide behind a third party supplier - I have a purchase contract with GALAXUS, not with the third party supplier.