Inexpensive (bought for about $12, although now identical model seems to cost more) earphones from Koss. Some love them, some hate them - sound quality is good in general, although there may be too much bass depending on preferences. They are relatively big for earphones and this kind of design is not too ergonomic. My biggest issue with them is degrading foam - this is "memory" foam that is supposed to fit in ear when squeezed. It should retain sqeezed form for a few seconds, but with time it looses this "memory" property and starts behaving like plain rubbery foam. It probably would take few months, but after time you won't be able to fit them in ear canal at all. Second issue: this plastic is brittle (or gets brittle with time?) - one of my earphones cracked after being dropped on hard floor, so I had to glue it with 2-component resin.
Two identical in size foam sets were included in my package. Additional ones are somehow expensive - I'm seeing them at $12 (+ shipping cost as you won't find them at local shop) for 6 pairs at the moment.
These earphones were covered with lifetime warranty, although there is processing fee that makes it not viable economically (processing fee is basically same as earphones cost).
