In my magento shop, the same products will have a slightly different cost based on some cases but I sell the same price.
Question: how do i set up my product so it has multiple source costs?
Idea Question: Is there any way I can fill in the products cost after people placed an order, also including the amount and the provider's name.
What you do is set up Tier Pricing and Customer Groups, so that you have a different price structure since thats what your wanting. To add a price later would be maybe something something like using an observer class Magento : how to change item price when adding it into the cart