Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs.
Amazon customers are loyal. Beyond that, Amazon customers--especially Amazon Prime members--are more than happy to convert. According to a 2015 report, Prime members are said to convert at a rate 22 times greater than customers that shop with other top online retailers. So, if you can tap into that audience and appeal to their willingness to spend money with Amazon, you should see a good return on your decision to join the program.
18. CraigsList – Some things don’t ship very well. Other things may make you feel uncomfortable to sell to someone across the country. Anytime you’re selling a large item or something you just don’t want to ship, Craigslist is a great place to go. It’s simple to list your item (again, take good pictures!). If you don’t like the idea of putting your phone number out there, the interested individual can send you a message to your inbox without even getting your email address.