Running a coupons website can be very lucrative. Find a coupon niche, select a WordPress coupon theme, and then display relevant coupons on your site. When your audience uses the coupon codes or discount links, you will earn an affiliate cut, for example, you could set-up a site dedicated to iHerb Coupons or add a page to your website with Web Hosting Promo Codes. Coupon websites are quite high maintenance as they need to be constantly updated with new offers. However, if you build up an engaged audience and allow them to post coupons and discounts they have found themselves, then quite quickly your workload will reduce.
If you are particularly knowledgeable on a certain subject, or if you are a good creative writer, you can write an ebook in a fairly short amount of time. Many websites are dedicated to selling ebooks, but by far the biggest marketplace is Online Shopping for Electronics, Apparel, Computers, Books, DVDs & more, which brings in millions of people a day looking for a new ebook. Your work will need to be formatted a special way and the content will need to be approved before it is published, but there are authors who routinely make five figures (and more) just from putting out Amazon ebooks.