Where can I sell free online?

I've been wanting to sell free online but it seems everybody charges, going through sites I have stumbled on www.sheepbuy.com and they state you can sell as many items as you want free of charge through paypal buy now button, which is also free, it also states that the money goes directly to seller nothing is charged or any percentage is taken. I just wanted to know if anybody has tried it out and if it has worked for them, it looks pretty straight foward and I find it interesting that they don't take part of the cake. Let me know.