Nostalrius Begins - Quality wow vanilla realm (1.12)

You can't accurately list items on the AH for cheapest items.

I got a feeling this would be clientside instead of serverside. I don't think there's a perfect way to retrieve the lowest bid or buyout if you don't have an AH addon like Auctioneer, Auctionater, etc. These extend the functions and even have their own tab for the market. I've never crosschecked whether or not these addons retrieve the lowest bid/buyout in their own tabs, but the prices seem fairly low depending on the highest bid/buyout in the tooltip.

Auctioneer can help you find the cheapest price.