When you buy at the Market Boards, click the item and see if there are High Quality available and the price. HQ are equivalent to aethereal and you sometimes can find unexpensive ones (for example the ilevel 55 PLD shield if you are lucky, it is hard to obtain the drop in WP and it will be the same principal stats.) The stats you see of items without clicking are of the normal quality items, there might be one HQ that suits you and you don't know it at first glance. Yo see the HQ stats putting the mouse on top of the HQ item icon.