(As an example, this still happens, even now: Just recently, I spent 4 months working on a business idea with my team, spending a huge amount of time and money, until we ultimately concluded it wasn’t worth it. We shelved it away and I wrote an email to the team, telling them, “We can’t figure out how to make this work. We’ll re-look at it in 2 years.”)

A brand new way of selling t-shirts has arrived online, and sites like Teespring allow users to sell shirts that are of a great quality and don’t get created until there are enough buyers interested in the product, sort of like a shirt-on-demand business. Earnings for the campaigns can be discerned via the site’s data about the amount of shirts sold and the price per item.
Shopkick is the shopping app that rewards you with FREE gift cards for the shopping you already do. You can join the millions of Shopkickers who have earned over $63.8 million in free gift cards to Walmart, Target, Amazon, Starbucks and more. You can get points for just walking in the door of some stores (including Walmart, Target, TJMaxx and more), for completing various offers or buying popular products. 
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I personally like this one for some spare cash. It does not take much to earn an extra $20 – $50 a week. Some claim that they are able to make a living by dedicating their time to different jobs at mTurk. You will have to go through a learning curve, but once you get comfortable, you will find plenty of good and interesting HITs (Human Intelligence Tasks) to work on.