spareparts

Hi everyone My transmission is bust and i'm looking to replace it with a used transmission as it's not worth buying a brand new one. I can't find any dodge grand caravans for sale as spare parts here in Whistler / Vancouver and was wondering if the same transmission is used in other vehicles...

Where do people buy : 1) the cheapest spareparts for maintenance and repairs? 2) for styling and cool features specifically for this car model ? I live in Europe, but i guess a discussion on the options in many geographical areas would be valueable for many in here.