If you live near a university, there are likely all sorts of research studies looking for participants. While I was an undergrad at Virginia Tech, I got paid $500 to participate in a 6-week dietary study. The study provided all my meals and paid me, but I had to eat a 5,000 calorie diet of 50% fat for 6 weeks, plus I had multiple muscle biopsies, urine/blood testing, etc.
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.
Smoking is on the decline, but those still hooked on tobacco will pay almost anything to satisfy their nicotine habits. The same is true for drinkers of caffeinated beverages. Appealing to vanity is another lucrative business.  Think of all the money spent on face creams, hair coloring, botox injections, body-slimming gyms—and all the gorgeous clothes to fit on those magnificent bodies.
Salvage and resell. Do you love antiques or have a knack for finding valuables at flea markets or yard sales? If you do, it might be time to consider salvaging items for resale – or even scouting out antiques to sell for a profit. While you’ll need to spend quite a bit of time searching for prospects and spend some money buying upfront, you could easily turn a profit if you know what you’re doing.
Often, what happens is that we run into unscrupulous Internet Marketers (IMs) who have less-than altruistic intentions of extracting money from you rather than helping you to make it. However, this isn't something new. People have been falling for networking marketing, pyramid schemes, and affiliate marketing scams since before the start of the net.
Amazon Mechanical Turk is a service that lets you make money online through doing paid microtasks. Each task is something simple that requires human interaction like rating search results, checking for the right spelling on search terms, categorizing the tone of an article, or even basic translating. You can do these tasks from anywhere you want and make money online from the world’s largest e-retailer.

A site called User Testing will actually pay you a fee to evaluate websites. It typically pays you $10 for each video that you review – which typically takes about 20 minutes. If the work is there, and you are particularly good at it, you could earn up to $30 per hour. That’s a pretty solid pay rate for a work-at-home job. You wouldn’t have to work a whole lot of hours to generate a decent part-time monthly income.
There are a variety of tasks that you may be asked to perform. This can include delivering documents, delivering food or restaurant meals, taking pictures of a building for a real estate developer, taking pictures of a menu in an upscale restaurant, or even delivering auto-parts. If you have a good working car (or even a good bicycle), time on your hands, and a lot of energy, this can be a real opportunity to make money online.
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.
Need more ideas on how to make money online? Another strategy is using webinars to market your product, service, or course. I’ve done webinars to promote my financial planning practice and to drum up interest in my online course for financial advisors. With a webinar, you’re basically offering a lot of tips and advice for free — usually in a live format. At the end though, you pitch your paid product or service with the goal of securing a few deals.
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