Trade Skill Components
Players with trade skills will pay money for stacks of normal and rare components, such as medium hide, 20 light leather, or a lesser moonstone. Ask around before selling these types of items to the merchants. 

Making Deals
The goal of a seller is to get the best item or the most money for their item. The goal of a buyer is to try to get deals on items, and to get them as cheaply as possible. Prices are not fixed, so haggle. If the person won't go for the deal, chances are someone else will. If the person has a very valuable and rare item, you might have to give in to the seller's price if you really want to get the item. If you're having trouble selling your item, lower the price. Find out what an item is worth. Figure out how rare it is and what people will pay for it. Look around and see what people are offering and are paying for items. Then come up with a price or offer a similar price. You can watch the sales of other similar items to find out what your item is worth. Item prices will change depending on the time of day, which determines how many players are on. There are also many other factors that can make an item more or less valuable.

How bad do you want the item?
That is a good question. Be sure you don't let the other person know how bad you want the item; otherwise they will have second thoughts about trading it. They will think "If this person wants it this bad, how much will someone else pay?" If you really desire the item, you might want to cave in and pay whatever it takes to get it. But if you really don't need the item, pass up on an overpriced item. "I'll trade you everything I have" generally is not a good thing to say.

20 "bad" items don't make a good item
A common trading mistake is to assume people are willing to trade one good item for a lot of lesser items. This goes against the common selling strategy of getting the most you can for an item. Many people are looking to unload their items for valuable items or items they can use. When space is limited, they are often not looking for more items in return that they will have to unload. You can, however trade a few good items for a better item if the other person likes all the items you're offering. 

At last, if you want to become rich and mighty quickly ,I recommend you to visit www.gamesavor.com to buy some wow gold. The site is an expert online wow gold store to provide various game currency, power leveling and information service in the world of MMOGs. wish you a good play.