Online surveys: There are many online surveys such as https://www.airmilesopinions.ca/, http://www.cashbackresearch.com/, http://www.univoxcommunity.com/ that are offering people some money in form of reward points or actual dollars for taking surveys. The surveys are normally on your shopping habits, car purchases, health related, food that you consume etc.
The problem with most of these surveys are that it is hard to qualify for every survey. Some of them are pretty long. I tried these for couple of months and finally gave up. Not worth my time. These companies sell the data to the sponsor of those survey or analyze it for their own purpose for mostly marketing purpose. Both the survey participant and the survey provider are making money but to me it seems more helping survey provider than the taker. There might be some who might have successfully made some money out of it. May be try and see for yourself.
Rewards and Loyalty programs: There are lot of loyalty programs starting from airmiles, aeroplan, petro point, td rewards etc that offer reward points for customers who are registered with their loyalty programs. In a long term it is possible to collect enough reward points from these programs if you registered in more than one program or you use one program to the maximum. For instance, airmiles has tie up with lot of sponsors such as esso gas, children's place, etc. Customer using this card at the locations can accumulate enough points though it is very slow process. Now what this has to do with data? Are these companies just making you be loyal to some companies. That is partially true. These loyalty companies are basically marketing companies that analyze the customer behavior, profile them, analyze the products and they sell it the sponsor companies.
Mobile reward apps: Have you heard of checkout51 and snapsaves app? If no, please check it out. If you shop a lot at grocery stores then these apps are meant for you.When you enter a store, just checkout all the products on offer in those apps. Buy any of those products that are offered by those apps and you get a dollar or 50 cents and sometimes 2$ -5$ discount on the products. You can take a photo of your receipt and send it using those apps and if approved you will be credited with the money promised to you. It is quick and you can collect some real money on it. Now this is data in your finger tip that you can use to make some cash. Isn't it?
Ghost/mystery shopper: is a tool used externally by market research companies or internally by companies themselves to measure quality of service, or compliance with regulation, or to gather specific information about products and services. Had tried http://www.lanla.com a while ago. This company pays you for evaluating quality of service for example a restaurant or a store. The shoppers specific identity and purpose is generally not known by the establishment being evaluated. Mystery shoppers perform specific tasks such as purchasing a product, asking questions, registering complaints or behaving in a certain way, and then provide detailed reports or feedback about their experiences. So the shopper provides data to the agency that is performing this evaluation and both make money from it. Sound like a good idea for shopping freaks?
Build your website: If you are reasonable good with technology then it is easy these days to build websites. The website could be a blogging website that you can create on www.blogger.com or www.wordpress.com and it is easy to get started in minutes or it could be a forum or some website where you sell stuff like ebay or kijiji. There are numerous templates available to build the website of your choice. Once you have your website, you can monetize it by selling ads on your website. Google adsense or clicksor kind of companies allow you to sell their ads on your website. Set up is easy and if you can build enough traffic to your website then you can make some extra cash from this endeavor.