So i seem to remember at one point in time Auctioneer had a function that scanned the AH and found item that were posted for a lower price (i think you could set the variance) than recommended. Is that feature still In Auctioneer and i cant seem to find it? Or, if it is no longer implemented, can we get it back? It was nice to run that now and again and find a 300g item listed for 20g.
In the auction frame there is a magnifying glass in the top left corner (next to the scan button). Right click it to see the search interface. There are various searchers depending on what you want, check the help pages for the individual tabs for more.