Bookscouter will give you Amazon.com's trade in value, where you mail Amazon the book and get a gift card, they will not give you the used selling price because it's hard to compare apples to oranges. You may be able to get more for your book by selling it as a used book on Amazon, so be sure to double check that price. As an example, the trade in value of a book I looked up was $7.87 but used copies were on sale for $19.87.
“I participated in an in-home product trial study. A coffee machine company sent me one of the coffee makers along with about 200 coffee pods. I received $7 for completing 3 short surveys. Plus, after the study, the company said I could keep the coffee maker. So, I got like 4 mos of coffee for everyone in my household, a free coffee maker and $7!” - David W.

The peer-to-peer concept is coming to virtually every corner of human existence. That includes the hospitality industry. Through AirBnB you can actually rent out your house for various lengths of time for a predetermined fee. That gives you an extra income on your house and gives the visitor the benefit of having an entire house, rather than being crammed into a single hotel room.

If you have an eye for design and some experience of creating websites, then you could offer your services as a freelance web designer. You will need to create your own stylish website, and have a few other projects that you can show potential clients to demonstrate your skills. You will also need to initially spend time emailing businesses to promote your services and find work. 

26. Services – You can offer a paid service, such as life coaching, blog coaching, goal setting or financial planning. Just be sure to investigate all the legal implications and make sure you’re not claiming to be a professional if you’re not one. With a service like this, you’re basically using your blog to sell yourself. You’ll need to convince people that you’re worth buying and then be able to back up your claims once they purchase your service.
Similar to a YouTube vlogger, if you have a large following on Instagram then you could become an Instagram Influencer. You will be paid to promote products in your photos, from wearing certain clothes to action shots of you using particular merchandise. As your Instagram following grows, you may start out simply receiving freebies in return for a picture of you with the item in shot. However, for those with followings running into millions, you can expect large payments to display products in your pictures. Use sites like Hype Factory to help connect you with companies prepared to pay for your influence.
It is easy to create an account on Reddit, so becoming a “Redditor” doesn’t take much time. With over millions of subreddits, Reddit is a great platform to discuss basically anything. It has an enormous amount of loyal and diverse user base. People literally spend days continually surfing through its never-ending posts and comments. It’s an ever-growing community.
It's a little more involved. Companies, especially those with stores, will want to get the opinion of the customer as they go through a transaction. For a bank, it might be opening up an account. For a retail clothing store, it might be trying on a shirt and checking out. Sometimes it's just calling up their customer service line with a problem and seeing how the representative treats you.
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Paid survey site companies invest billions of dollars into marketing research online.  They always want to find out more intricate details of a consumer's relationship with their product.  Whether it's a new television show or just an existing product line, companies like Disney, Samsung, and Sony go to great lengths to find out their ideal audiences.
Research other listings in your city on AirBnB and see what the going rate is for a place like yours. You could also just rent out a private room as well or even a bed in a shared room. In fact, that's how AirBnB got its start. However, you might find it hard in the beginning without reviews, but as long as you take really good care of your guests and provide a lot of value, the reviews will eventually come rolling in.
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