Just got these - Coby CVE92 Isolation Stereo Earphones, and I have to tell you I am very impressed by these $4.99 (+ $3.99 shipping) headphones. Sound isolation is pretty good and the stereo quality and bass is incredible for the price. The only thing I worry about is that the soft-rubber on top might fall off in time, will just have to wait for that day :P

All in all, excellent purchase!