[devhen]

Checkout Doc Holliday's list:
 
http://www.head-fi.org/t/625124/over-performing-over-achieving-headphones-iems-for-their-price-range-top-cost-effective-cans-iems
 
I have the CX200 and 8320. The 8320 sounds a bit better but it depends on the tips and how well they fit & seal in your ears and the shape might not be for everyone, they're a bit big and can be uncomfortable for me at times. The CX200 sound pretty good for the price, especially with comply foam tips. Newegg has them on sale for ~$17 pretty regularly.

 

[Dah-Dee]

Some other ideas (Amazon prices):
 
 
[size=1.7em] Panasonic RPHJE120 ... <$6[/size]
Philips SHE9550/28 ... $11-14
[size=1.7em] Philips SHE6000/28 ... $13[/size]
[size=1.7em] JVC HAFX8 ... $6-8[/size]

 

[wippo808]

Monoprice 8320
Philips SHE3580
JVC FX101/FX40
Panasonic HJE355
 
All good contenders for $10-20.  I enjoy some of them more than $50-100 pairs.
 
Edit: lol just realized this thread is ancient...

 

[loganmark]

You should give a try to FSL Zinc Zn-30 with price less than $9....

 

[Redcarmoose]

http://www.head-fi.org/t/843190/the-7-cubu-earbud

 

[loganmark]

FSL Zinc Zn < $8

You may find it awesome. Try it.

 

[AlwaysForward]

Chinese HiFi has a lot of options. Probably something from Knowledge Zenith like the ATR