My 10-year-old son brought home a book from our park’s free library box. It was a biology textbook – teachers edition. He said it looked interesting and hey, it was free (having no idea you could sell it). I scanned it in my Amazon seller app and realized it was worth around $150. He was so excited. We listed it for sale for $130 and it sold! Going to tell him, he just made $130!
Running and charging for webinars can be a great way to build a following in your niche, demonstrate that you are an expert in your field, and make a profit. Hosting a webinar can be hard work. They need to first be promoted, provide original and valuable information, and include interactive elements so your audience can ask questions and engage with your topic. However, once you have built up a large blog following, each webinar can be extremely profitable.
You have likely heard of subscription boxes such as Birchbox and Julep. While almost anyone can start a subscription box service, they can be incredibly labor-intensive and the profit margin usually isn’t so great for those operating on a small scale. Did you know you could start a subscription for your knowledge that’s almost pure profit? With sites like SubHub, you can offer a monthly membership offering anything from meal plans to workout plans to crocheting patterns and beyond. The sky is the limit. You do need to provide new content on a consistent schedule to keep your customers happy. But if there is something your friends are always looking to you for new ideas, you may have an easy little side business on your hands.
Not necessarily new, but definitely a great opportunity! Jen Henson was a teacher in Ohio when she was approached by her principal to tutor an athlete preparing for ACT testing. He had a full ride offer from a college but need the test scores to seal the deal. After hearing about the results Jen was able to help this student achieve, he’s in the NFL today, she started being approached by other coaches.

Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
Consider selling in lots. A lot is a collection of similar items that is sold in a group. For example, if you have a collection of books, magazines or similar pieces of jewelry, consider selling them all at once in a lot. You many not make as much money as you would have if you sold each item separately. However, the items will likely sell more quickly in a lot than they would individually.[29]
It’s possible to set up a website yourself, but unless you’re a designer or Web developer, you can expect a pretty steep learning curve. If you have the budget, consider hiring a professional to help you with some or all of the following: configuring the site to look the way you want and include the features you need; creating and inserting a logo; optimizing the site for search engines; and creating text and images.

This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.
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