http://www.uesp.net/wiki/Oblivion:Merchants Of course it all depends on what you are selling. Hope it helps.
Thanks, I had a very quick scroll though and could only see the most gold a merchant carries is 2,000 gold, so if I understand it right, this means that the most I can get for an item is 2,000. If that is in fact the case why value items more than 2,000? an item valued at 5,000 is pointless, because you are never going to get more than 2,000 gold for it. Unless I'm missing the point?