I usually buy these on the internet, which is convenient but cheap.
I have always used Skull Candy earphones for all my gadgets because it never failed unlike the cheap ones. I haven't tried other earphones though, except for apple and cheap ones.
Walmart or Best Buy should have them.
The negatives in purchasing cheap earphones are many. Poor fit to your head with no way to adjusting them properly. Poor sound quality. Outside noise interference.
None
sennheiser
Skull candy.
If you own an iPod, then you most certainly are a lover of music and enjoy listening to it whether you're at home, in the car or at the gym working out. What can make or break music is the sound quality and with the iPhone, that can come down to the types of earphones you use. Some of the best include the Westone 4 earphones and the Shure SE425 chrome earphones.
You never can go wrong with SkullCandy ones.
One can buy wireless earphones from stores like Best Buy, Future Shop, Target and many more. One can also buy wireless earphones from sites like eBay or Amazon.