from FredFlare.com:
mixtape USB memory stick
"Are you dreaming of days when you made mixes for your friends on those old fashion cassette tapes? Then relive them with a retro USB memory stick! Comes in neat cassette tape package. Stores up to one hour of music. 64MB. Surprise assortment of mixtape styles!"
It retails for $22.
[Thanks to Jeff Kent for the heads up.]