As far as I know, you can't buy equipment in Ether Saga Online, but you can learn vocations. You can go to Roki and...oh i can't remember his name, but the guy by the east exit with two other people that look like kids in the middle, you can go to him too, and depending on your class of weapon, you can choose a vocation, which with the right things and level, you can create a weapon or armor. Very helpful. But sometimes you get armor and weapons on quests. npc's and player trade
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Ether is a very helpful item that none of the pokemarkets sell. You only way of having an ether is by finding it. An itemfinder is most useful.
You have to buy them.
I don't think you can; you have to find them
In the pokemarts. I think goldenrod
Neither item can be purchased. Normally you can find some throughout the game.