AuctionLite's "Sell" tab. AuctionLite will suggest a price based on the current competition, and it will allow you to post multiple stacks with one click.
An AuctionLite tooltip showing vendor, disenchant, and auction prices. Disenchant prices are based on the current prices of enchanting materials at the auction house.
A standard AuctionLite tooltip, showing vendor and auction prices for a stack of 3 Cobalt Ore.
AuctionLite's "Buy" tab. When your search matches multiple items, you'll get a summary of each item found.
AuctionLite's "Buy" tab. You can view all listings for an item sorted by per-item price, and you can select and buy multiple listings at the same time.