Feel the market

Avoid buying from NPC merchants. They usually tend to cost more than buying from another player in the game. If you are planning to purchase a new set of equipment or any other item, buy them from Giran. Taxes there are only 10% and when you buy in large amounts you tend to save alot more. Do not sell off your loots immediately. Try to find the best bargen for them. Look around for players who are spamming "WTB...". They tend to offer a higher price than normal since they probably have important use of it. Private stores can be one of your biggest assets in the game. You can easily browse through a wide selection at various prices, although it may lag alot but sometimes it can be worth the time spent. You may also want to setup your own store as well when you want to sell off your items. Would be ideal when you go AFK for a long period of time or planning to go to sleep. Don't start your store and stare at the screen though, that's just silly and a waste of time. Avoid selling more than 3 items at a time, set price 5-10% below shop price. You should be able to get a good return within 1-2 hours.