WarraWarra, they are an ODM (Original Device Manufacturer) they only make device to their customers specs. So Dell says "build me this" and they do it. This most likely includes most models from many many companies.
quanta builds a good bit of acers laptops also. prices for the mb's range from 50-600$ depending on what it has on it. some of them have the 3dchip and processor on the MB which jack the price way up. processor you dont see as much, 3dchip you used to but now everyone is moving to pciexpress.