When you are a bigger company, you can consider owning multiple parts of the supply chain, or rather let the original suppliers doing the work. But for small businesses, the dialog isn't that way. However, you can try to have a global look about the supply chain, or rather ask the "end" bound of the supply chain where you will purchase the product and sell/transform/market/manufacture it. What I means basically, is that you can let your supplier independent, you just give the constraints and let it sees with its suppliers where they can get the materials and products you need. You can also try to know the whole supply chain and "manage it", even if your power is limited. How would you play here? Do you think suppliers and factories are often on their own, caring themselves about their own suppliers instead of letting their clients telling what suppliers to choose?