A great method to earn money online is buying second-hand products at low rates and selling them at a slightly high rates for profits. Now I am not saying that you must sell substandard products rather what I am trying to advise is that you can sell high-quality products online. For example, I am sure many people sell second-hand products on Ebay. Unfortunately, I am not into online selling as I believe that it is not the only great way to make money and it's not my cup of tea.