We see that here in the US sometimes. I buyer might buy up surplus or obsolete stock from an original manufacture for pennies on the dollar and offer them to the general public for dimes on the dollar. The problem is that once the stock is sold it will most likely not be available ever again at any price, so that is not a safe way to procure parts for a commercial company where you have be think about future availability of the parts used in commercial offering, but is a great way for a hobbyist to procure stuff.
Lefty