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Thieve's Guild Hood is one certain suggestion, and you get that after joining the Thieve's Guild, obviously :P
A Dragon Priest Mask named Volsung is another certain piece, but aside from these two I don't know of any certain items. Keep checking the shops. Also, level your Alchemy or Enchanting up, because both of those will get you what you want.
@George it's called a business. They are there to make money, and it's in the same sense as a pawn shop. Getting your speech up will help you get better prices. Also, most dungeon loot is level specific, especially in the giant chests.