Do pharmacies and clinics generally buy locally or directly online?

Now the third-party platform is so convenient, mainly because the price can be compared. We are a health station in the town and will purchase through a third-party platform. Traditional Chinese medicine pieces such as kidney bean health care and equipment such as Beden are commonly used, but they are not only bought in one place, so we still need to compare them more. The quality is similar, depending on the price and logistics.