I like these ideas! Besides being good ideas in themselves, they stimulate MORE ideas! Some of them reminded me of something I was reading about called Craigslist arbitrage – buying low and selling high on craigslist, kind of like the first part of the old Oregon Trail game, but with washers and dryers and bicycles instead of cases of crackers and horses. Sounds like fun!  Anyway, that one about the pooper-scooper business, that works, I know because I was quite successful in the pooper-scooper service I started back in 1988! I’ve been in the industry for 25 years now, though I don’t go out and scoop any more.
Start with a very good checkout flow / payment gateway right from the start. I’ve spent too much time thinking I could whack some checkout together with PayPal and a (typical Dutch) bank payment system, but ended up with a lot of coding and hacking into WordPress to make it all happen. Actually, the right checkout still hasn’t been implemented #@!^&*^

If you already have a website that's driving in targeted traffic, a great way to make passive income from the content you're already creating as an easy side business idea, is through affiliate marketing. ShareASale, Rakuten, Clickbank, and Skimlinks are a few of the best affiliate networks and tools that can help you make money from the content you already produce, thus amplifying your side business idea income. Check out this extensive list by Justine Grey, covering the 59 Best Affiliate Programs for Business Bloggers to get some inspiration on how other bloggers are growing affiliate blogs from side business idea to full-time company.
Recently, I have been thinking about my other passion… motivation and inspiration. I have though that maybe my unique advantage is to merge my photos with words of motivation. I could add more products such as posters, calendars, cd’s, etc. much like one of those motivation sites. It would be personal to my photography and my knack for inspiring others.
Maintenance work from the comfort of your garage or basement is challenging on two fronts: overall set-up (equipment, ventilation) and finding clients. Take shoe repair. Ben Roush, a cobbler in Omaha, Neb., says that used finishing machines (with the proper buffering and sanding devices) go for $10,000; stitchers, $1200; and hydraulic presses for adding glue, $300. Some repair work requires more electrical power, too: 220 volts versus the typical 110 volt capacity in most houses.
People love to spend weekends rummaging through tables full of other people's unwanted items, looking for treasures. Make sure to change your layout and put new stuff out for sale often. You want people to come back time and again to see what's new. You don't even have to have that much new stuff to make things look new. Just moving an item from a table to the top of a bookshelf might get it noticed, even though the item has been in your inventory since you first started having sales.
Sure, there are plenty of businesses offering social media consulting services, but you can stand out from the crowd by focusing primarily on networks that are still gathering steam with businesses. Facebook and Twitter are still the top networks, but businesses tend to struggle the most with more visual platforms like Instagram, Pinterest, Tumblr and Snapchat. All of these platforms have huge audiences, but many businesses don't realize how big they really are, how effective they can be and how to make them work for their niche. Snapchat has more than 158 million users per day, according to Business Insider. Instagram has more than 500 million daily active users, according to Statista, and Pinterest has more than 200 million. 

Driving for one of the two globally expanding app-centric taxi alternative services, Uber or Lyft can still be a fairly lucrative way to earn money as a side business idea on nights and weekends—working only when you want. But before you dive head first into this side business idea, do your homework and calculate the costs of extra gas, mileage, tires, wear & tear and usage on your vehicle—it's not a guaranteed business idea that'll turn a huge profit every weekend.
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