Job well done, Satrap. The first thing I look for in a site like this are signs that the author is being paid to hype the companies. It’s very tough to find good information that isn’t stricken with bias. There were a couple of times during the article where I actually got excited thinking, ‘Hey, I could do that. I’d actually LOVE to do that.” That being said, I can’t help noticing that you refer to all of it as “extra” or “supplemental”income. Are you saying that with all of these options, sticking to one’s regular “day job” is required? In your experience, if someone really commits to doing this, is it possible to earn a decent living? Cubicles suck.
There are times when many of us find ourselves in a bind and we need money today, even if it's just a couple of bucks. Fortunately, there are some websites you can use to earn fast cash online. I'm not going to lie to you, many of them are just extra cash online and will never replace your income. Regardless, they can save you in a pinch when you need it most if you use them regularly and allow the money to build up.
You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service and refunds. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. It is hard work, especially on your own. You could opt for Amazon's platform, which might be the easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not. 
Once you really focus your efforts on one method and stop jumping from one thing to another, you will soon start to see results. And once you see results, motivation will take over from there and you will just keep going. The problem for most people is that they give up usually right before they see results. They work for a few weeks or months, they don’t see results, they give up and go for another method. They repeat this with any method the come across, and never make any decent money.

Of course, you have to be realistic. Just because some people make millions, doesn’t mean everybody will. But you’re not reading this post to become a millionaire, you are here because you want a free way to make some extra money and making YouTube videos is a great way to do it. Who knows, maybe your YouTube channel will one day become a huge and earn you hundreds of thousands of dollars.
17. Amazon – Have you heard of FBA? It stands for “Fulfilled by Amazon” and it’s getting pretty popular. Basically, you buy products (in bulk is best) and ship them to Amazon for them to store. When your products sell, Amazon packs them up, ships them out and sends you the money (after taking their cut). There are people making a full-time living from FBA, while others just do it for some extra money.
So, I started reading and learning about affiliate marketing and blogging. I combined the two and after a 14-15 months of really hard work (sitting in front of computer for 14-6 hours a day and putting things I had learned, into action (building a blog, writing articles, promoting the site, etc), I started making enough money that I started believing in myself and the idea that I too could make a full time income online. From then on, I just kept on going and the income grew and grew. Now, I still work 8-10 a day on my online business, and sometimes even more. You have to constantly work and maintain it. Most people think because its online, its easy. That’s where they get it wrong.
Ebay is a bellwether. It's been around since nearly the start of the online boom. But, like any other platform, success can seem fleeting if you don't know what you're doing. Selling items on eBay, professionally that is, can be an art form. Getting people interested in your auctions isn't always easy, especially when there's hefty competition and low demand for what you're selling.
According to Webopedia, “Search engine optimization is a methodology of strategies, techniques, and tactics used to increase the amount of visitors to a website by obtaining a high-ranking placement in the search results page of a search engine.” And as the internet becomes even more crowded, search engine optimization (or SEO) grows even higher in demand.
Sure, there are some options like blogging that can make you a full time living but it takes a lot of hard work and dedication. But the majority of these methods, like surveys, reviewing, money making apps and so on, are not going to help you quite your day job. They are great for earning a little side cash in your free time. There is no need for me to hype things up and tell you otherwise.

5. Fiverr – Fiverr is a great place to make a few bucks or spend a few bucks if you need some of the services people offer. Basically, everything is $5. You either pay $5 or charge $5. They call them “gigs.” You can offer your services however you choose. If you sell art and you’re fine selling pieces for $5 each, that’s a gig. If you’re a graphic designer and you want to offer your services for $10/hour, simply offer a 30 minute gig. If they need two hours of graphic design, they pay you $20, or $10/hour by buying four gigs.

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