I just recently joined this site called Fiverr©. It is a pretty nice site. You can buy and sell things for just $5. This site has been around for a considerable time now. 
How it works?
Buying - on the site there are 16 categories where you can select what you want to buy. Things you can buy range from videos, banners, postcard, and even songs. You can customize orders from the site. There is a great tool that enables the buyer and seller so they can make transactions go smoothly. When buying, buyers pay in advance. Buyers can pay via their PayPal account or credit card. Order can be cancelled anytime until the seller accepts the order. Buyers have the ability to rate the sellers work.
Selling - selling in Fiverr© is really easy. The sight have this guidelines when making a campaign. I think this a plus for the site. I made two campaigns so far and they received a total of 50 views in a day. I also got one order from one of my campaigns or "gig" as they call it on the site. My personal experience in this site is excellent. Revenue sharing is great but your net share would be $4 from the $5 the buyer paid. Sellers can withdraw their earnings through PayPal with a 2% fee. Better earn at least $100 to make the 2% fee not significant. Funds are cleared after 14 days. There's a big feature that makes becoming a seller here enjoyable and also fun. 
I really recommend this site for people who have spare time and has knowledge on the categories they have.