[canadianballer]

I have a pair of Shure SE310's but lost the 3 ft extension cable that came with the headphones, rendering them useless at the moment. Where can I get a good extension cable without spending a fortune? 
 

 

[Soyuz]

From my experience this cable from eBay is very fine. I own three of them and haven't failed in the last six/seven months I own them. They cost less then $2.5 each!
http://cgi.ebay.com/3-5MM-Audio-Extension-Cable-for-Sony-MDR-EX700-iPod-MP3-/250660342779?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a5c854bfb

 

[canadianballer]

Are they legit? How is the sound quality on them? I have some cheapie 6 ft cables and they make everything sound terrible (probably due to resistance).

 

[Soyuz]

I'm not sure if they're legit, but given the price they might not be true Sony's. The sound quality on them is just fine, I hear no difference listening to my phones with or without this extention cord.
The build quality is very good, the cable itself is rubberized and the plugs have metal housings. Like said in my first post, after six/seven months of daily usage they're still working and looking like new.