Unfortunately the addon you're looking for (FuBar AuctionFu) is no longer officially maintained, but a fan did attempt to fix it to work for tbc and says it's working fine. I don't use this myself, I just dug the thread up for you. Good luck. =)
http://www.wowace.com/forums/index.php?topic=7144.0
Download link is in the second post from the bottom at the bottom of the post.