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!
Amazon. Many people don’t realize that Amazon is a haven for third-party sellers cleaning out their attics and garages. If you plan to sell more than 40 items per month on Amazon, consider registering as a professional seller. You’ll need to pay a roughly $40 monthly subscription fee, a referral fee that usually ranges from 6% to 20%, and a per-item closing cost for media items. You won’t pay the per-item selling fee, however. Alternatively, you can register as an individual seller. The fee schedule is the same as for professionals, except you do have to pay the selling fee and don’t have to pay the subscription fee.
UserTesting’s website testing gigs do require focus and rigor, but they’re far shorter and don’t need to happen simultaneously, making them much easier to fit into your schedule. They don’t pay quite as well as game testing, though. If you’re diligent, you can reliably earn $20 per hour, though the overall work volume is sometimes thin. You need a decent, relatively new computer or smartphone to complete tests.
If you’re a skilled worker in a specific niche, like marketing, design, or software development, there are specialty marketplaces that cater just to you. These are amazing places to make money online as you know that the people visiting them are looking specifically for the skills you have. Check out places like 99Designs or Dribbble for designers, Cloudpeeps for marketing and SEO professionals, and TopTal, Crew, or Gigster for high-level software developers. Once you’ve built up your development skills, you can begin building a brand for yourself as a higher-value consultant and start charging brands for larger projects like implementing an entire WordPress security overhaul or migrating a website from http to https.
If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.
Blogging is something that requires patience, persistence and discipline. It may mean writing everyday for over a year before you really start to see any money from it. There are exceptions to the rule, but from my dealings with other bloggers, it seems to be pretty common to spend one or even two years building your blog, your brand and your authority, before making any serious amount of money.
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. 
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