American supermarket giant Costco says it has its eye on opening stores in Australia, a move that would change the face of shopping there. Costco is a wholesale, no frills chain selling discounted products from massive airport hangar-like buildings. Apple Inc.'s iTunes Store started selling thousands of songs without copy protection Wednesday, marking the trendsetting company's latest coup and a model for what analysts say will likely become a pattern for online music sales. Apple takes music downloads to the next level by offering DRM-free music tracks supported by most MP3 players.