Recently a new service was launched, called MOCHUB (visit
mochub.com). You can order a creation from them and they will collect and pack all the necessary parts and give a link to the building instructions for the creation and ship to all over the world in two weeks or less.
The prices are not low, but not more than the price of collecting all the parts from probably several shops and sellers from maybe different countries with each of its own shipping costs. MOCHUB has several years experience in part trading.
My models currently sold:
Telehandler
Supercar