Become a babysitter. Babysitting is a common way to make some extra money on the side.[26] There are now professional services you can sign up for that will connect you with people who need a babysitter. For these services, it will help to pass a CPR class or other certification, or to have a talent or expertise for entertaining children. However, you might be able to make money more quickly just by babysitting for people you know, or by having friends refer you to others who need a babysitter.
Donating plasma can actually work out better than selling your blood.  It takes longer to donate plasma because they will put your red blood cells back in your system. The upside is that you can donate plasma as much as twice a week and you can make anywhere from $40-$60 per donation. You can make that $100 in less than a week if you can stomach the needle.
It depends on where you live. Many public places will require you to have a permit for sales. However, in a nice, family-friendly neighborhood as a kid, it would likely be fine. If you plan on selling street-crafts for a living, find out what the local regulations are and look into the costs of a stall, half shipping container or other form of suitable "pop-up shop" because you will be out there in all sorts of weather and you'll need to protect the crafts.
Amazon makes it fairly easy to list and sell old books on its marketplace. You can make more than just a few bucks If you have pricey text books from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart. Remember, add value where you can, no matter how small it might be and no matter how few people might readily notice it. 
Everyone knows that the quickest way to learn a new language is to mingle with native speakers. If you were lucky enough to be born in an English, French, Spanish (insert any of the world’s main languages) speaking country, then missing out on the opportunity to cash in on the skills you take for granted is exactly that – missing out! Use online communication tools, such as Skype or Google Hangouts, to connect with learners and leverage your privileges. Time is money, so package your hours into teaching sessions and you’re good to go. 
Ebates is another cash back app, similar to DOSH, and right now they are offering a $10 signup bonus. There’s no rule saying you can’t have multiple cash back apps, so why not sign up for a couple just so you get the bonuses? Once you get your bonuses, then just use whichever app gets you the best deal on your upcoming purchases. Easiest money ever!
Mobile applications are more popular than ever, and people are willing to pay good money for ways to manage their lives from their smartphones. If you have a great idea and happen to know coding, you can run with it and create your app yourself. If you just have an idea and don't know the ins and outs of how to turn it into a reality, there are plenty of software developers looking to collaborate with people on app creation.

Nathan Barry on bootstrapping ConvertKit: I’m a huge proponent of ConvertKit (and now an affiliate and compensated advisor). It’s user friendly, powerful, and an all-around great product. But one cherry on top is its origin story, in which Nathan Barry took it upon himself to create ConvertKit without any venture funding or any upfront capital. It’s fascinating and awesome!
Running a business consulting company is a great option for those who’ve been involved in the process of building a business before. Whether you’ve gained your experience through working with a number of different startups or learned the secrets of business management in a more corporate environment, helping other entrepreneurs achieve great results can include everything from business planning and forecasting to liaising with banks and institutions.
YouTube is the third largest site in the world, so there’s no surprise that video is becoming one of the main communication mediums for businesses of all types and sizes. If you have video filming or editing knowledge, it won’t take you long to build your clientele. Everything from video production workshops and video editing services to soundtrack libraries and DIY tutorials can appeal to the business world. Producing video might be one of the most attractive online business ideas with lots of creativity and challenges.
They don’t even have to be your bottles: Plenty of people are too busy or lazy to bother returning a six-pack worth of beer or soda cans for 30 cents and simply leave them out for curbside pickup. It may not be trash day in your neighborhood, but it surely is somewhere. Fill up a 50-gallon trash bag with cast-off cans, and you can redeem them for about $12 – it’s just a start, but you can do it again and again, and all it takes is time and hustle.
If your business idea requires a shopping cart service, I’d recommend SamCart as a great, inexpensive option. It’s also super user-friendly. If you just want to offer an ebook, they give you the ability to do that. They handle all the credit card processing, payments, and delivery. It’s pretty sweet. [Full Disclosure: As an affiliate, I receive compensation if you purchase through this link.]

While most of these companies advertise that you can earn upwards of $18 or so an hour, the reality is that you're not going to make that much once you figure in your gas expenses and wear and tear on your car. Also, work may not always come in consistently. I would recommend doing more than one of these if you really want to make it worth your while.
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