There's an ad running in digital life today 18 Feb 2009 - on Ultimate Ears (UE) offering up to $80 trade in value for "any" earphones - with t&c.
This is more of a warning than of a recommendation.
They mention any earphones but actually only accept UE earphones.
Here are the rates:
Triple.fi 10 pro - $80
Super.fi 5 pro & eb - $50
Anything lower - $30
Hope viewers to your site won't make a wasted trip or get disappointed at the store.