Highlight bag items I don't have on auction

[treehstn]

I'm looking for an addon that will highlight items in my bags and bank that I do NOT have currently listed in the Auction House. The problem I'm having is the time it takes to drag items to the AH sell window to see if I already have one listed. I'm selling gems and don't want to have more than one of each type listed at the same time but have multiples of each type in my inventory.

Any ideas?

Thanks!