The Key holder like DAP E2, available in different colors, supporting MP3, WMA, OGG, FLAC and WAV files and sold in 4GB is now shipping both in South Korea and in the USA for something around $65 USD.
http://www.akihabaranews.com/en/news-19243-iAudio+E2+Now+Shipping+in+both+Korea+and+the+States.html