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!
Find a profitable niche: We’ve talked about this a lot. But, where are you most comfortable. What niche do your skills, values, and interests intersect? Do you have 10 years of experience as a technical writer? Do you have long-standing PR relationships that’ll be invaluable in helping startups launch a successful crowdfunding campaign? Determine what makes your value unique, and lean heavily on showcasing that strength to your potential clients.
Give your opinion. At MySurvey.com, Surveyhead.com or ValuedOpinions.com, you can sign up to take surveys about products and services and get paid for it. Sites typically pay $2 to $5 per completed survey and will send you a check or deposit to your PayPal account, or gift cards or merchandise once you reach $20 in your survey account. Scam alert! There are lots of survey sites out there, but not all are trustworthy. Avoid participating in anything that charges a fee up front to participate. “I try to take three or four surveys each week while the kids are watching TV, and that brings in $20 to $30 per month,” says Rachel.

But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.


6. IZEA – IZEA works in addition to a blog or on its own. You get paid to blog, tweet, take photos and take videos. The pay is mostly based on your following, so if you want to make money with your tweets, you’ll need to grow you Twitter following.  Likewise, if you want to make money with blogs, you’ll need substantial blog traffic (more on blogging below).
Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income. 

Just be sure to put a lot of care into your product listings. Everything from the titles you use, to how effective the description is at convincing potential buyers your product is better than the rest, and even taking care to shoot high quality product photos can have a dramatic impact on your sales. I recommend using photo editing tools like Fotor, which gives you the ability to edit your images, create captivating graphic designs and more.

This isn’t to scare you off. I simply want you to know that this guide is going to focus solely on ways to make real, sustainable extra income online. Not just a few bucks. I want to share all the mistakes I've made that got me to where I am now so that you don’t have to go through them, and can build a successful online source of income for yourself.
If you want to clear some space out in your house and have a big stack of books you’ve been holding onto for too long, you can make money selling your books and textbooks online. Stores like Half Priced Books and others will give you cents on the dollar for each of your current books while you can check what your book is worth by simply entering the ISBN number on Book Scouter.
When career librarian Rachel Singer Gordon, 40, of Lombard, Illinois, quit her job in 2005 to take care of her children and pursue freelance writing, she knew she’d need to find other sources of income to supplement her writing. She dove headlong into couponing and frugality, and became a wizard at finding ways to earn money online. Soon Rachel was bringing in small amounts of income from lots of sources she calls “multiple profit centers.” “They’re the equivalent of a nice, steady part-time job,” says Rachel. In 2009, she started the blog Mashup Mom () to share all the stuff she was learning. In fewer than two years, the blog has become yet another profit center for Rachel, as has her first book, Point, Click, and Save: Mashup Mom’s Guide to Saving and Making Money Online. Tap into multiple profit centers with Rachel’s favorites.
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