A conclusion is the place where you got tired of thinking. - S. Wright
Favorite rides in the stable: Indy Fab CJ Ti - Colnago MXL - S-Works Roubaix - Habanero Team Issue - Jamis Eclipse carbon/831
I picked these up last week to use with my mp3 player- AUVIO Pearl Buds with Mic (White) : Headphones | RadioShack.com, though I only paid $9.99 + tax and $2 for the replacement plan (earbuds don't last for very long). I imagine that you could buy replacement tips if the stock ones don't work out for you, but they fit me fine.
These replaced my old pair of earbuds that lasted maybe 2 months before it developed a short near the plug and I had to use my OEM earphones similar to this AUVIO Earbuds w/ Carrying Case (Black) : Earbuds | RadioShack.com, which was uncomfortable and if I turned them up loud enough to tune out the people around me, they could hear what I was listening to- just a bad design all the way around, IMHO.
I hate the earbuds that come with the iPhone, so I picked up a set of Skull Candy earbuds. They worked great, until one bud stopped working. I filed a warranty claim with Skull Candy, they had me ship them back (at their expense), and they issued me a store credit for a new pair. I picked up a set of the Fix earbuds. They're great. They fit in my ear, and they stay in. The mic and volume controls work great, too.