French entertainment store Fnac (equivalent to HMV) currently list a Jamiroquai USB Key and MP3 player for release on 20 November.

Both the USB key and the audio player (which is said to support MP3, WMA and WAV audio formats) have a 512mb capacity and will contain the "Best Of" album.

I do not know if this is a specific Jamiroquai branded player/USB key, or a generic one with just the greatest hits album pre-loaded....