What are you going to use them on? 3DS?
You may really find it weird, specially from me to say it.
But I really recommend the Apple MD827ZM/A. They sound quite OK for an earbud, they are cheap, and they are very comfortable.
They usually go for around €11 on ebay.
They usually last quite long, and mine were good for around three years, but after the third time I left them on my trousers' pockets in the washing machine, well, the cable went somewhat bad and one of the earbuds makes sounds only when it wants.
PS: I have both bought those one from China on ebay, I know the price sound a little fishy, but they are actually original ones.
PS2: I have also a lot of higher grade earphones, but for the price, comfort and portability these ones are great, trust me.