I just bought these Sennheiser CX300's on Amazon for $16.67 (Originally $49~) and I have to say, they are a great deal for in-ear headphones under $20. They come with different sized tips (I moved to the smaller ones), and have insane noise-isolating capabilities. Plus the bass on these guys are awesome. Read my review on Amazon here. I got them for listening to music at the school library because my other ones leak like crazy and I usually have to listen to my music very quietly (shhhhh) when I'm out and about. The thing I didn't take into consideration is the crazy amount of ear wax your ears are going to produce to combat the foreign object (earbuds) invading your canals.