Item prices
 

I am trying to find an addon that will show me the vendor price of an item when I put my mouse over it. Any information on sites or the name of the addon would be greatly appreciated. Thank you.

Darenizia

If you're looking for something that will allow you to see a comparison of prices between something on the market (player sold item) and a city merchant in the tooltip of the item, I highly doubt it would be possible, as the fine people here can only change the way the information SOE gives us.

Your best bet would be /feedback in game.