Using lulu can make you a good amount of money. You can sell your own digital products, or you can sell resell rights ebooks online using this website. You set the prices on these products and lulu takes a small percentage of the money you make since their service is free and they need money to keep the site operating.
If you don't have any digital products to sell of your own, you can always search for resell and rebrand rights ebooks online. There are many places where you can find free products to sell.
