This is a simple browser addon that you install and it will present you with a side bar full of relevant products to click on when you perform a search for something. Clicking on the items will reward you with a few cents or as much as a dollar. They now offer surveys as a way to earn, too! You can install the Qmee addon in Chrome, Firefox, Safari, Internet Explorer and Opera. The pay is basically instant and you only need a penny to cash out! It goes straight to Paypal within a few minutes, usually. Go here to register at Qmee.
Fiverr is a popular platform for offering services. You can create your own Gigs to have available for sale. As the name suggests, Gigs are available to purchase starting at $5 though you can offer upsells to increase your earnings. You do need to wait 14 days between completing a Gig to being able to withdraw your earnings by PayPal. There are fees associated with these transactions.