Here is a very nice on-ear headphone that sells for $28 USD, in the U.S. It should be available world-wide. The downsides are 1) Very lightweight and plastic, with a possibly fragile non-detachable cable, and 2) A neutral-to-light bass response. All else is good to excellent.
Edifier H650 On-Ear Portable Stereo Headphone review | Headphones Hangout Forum