The best way to find cost effective products without jeopardizing quality is to use a company like Kanary that has worked for many years with reliable suppliers. If you plan on buying from China on your own, It is important to do your due diligence on suppliers and have sampling rounds.
The supplier should have in-depth knowledge about the products they are manufacturing and, even better, they should have a design/engineer team that can help them improve qualities and eliminate flaws.
Additionally, you should make sure you are purchasing from a supplier in the same region of China that you plan shipping from so that shipping costs do not significantly increase the cost of your product.
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