I've read this article on item flipping (specially the Types of merchanting was really interesting) but when I try to do some item flipping myself I tend to lose money every time! I've at this moment lost around 500 coins trying different items (first I would try one item then I would see if I could make profit) after trying around 20 different items (like iron bars, adamant arrows,feathers and coal ore for example) I haven't found any item that would make me profit.
I tried looking up which items where traded a lot on the GE website and found a few of the items there.
The problem is that I can't find an item to flip without losing money. Every item seems to sell for less than I'm buying it.
Is there a way to see what items tend to work for flipping?