I got a portable speaker sample from Neekspeaker.com which you can use with your mp3 player, cellphones, etc. Speaker design is unique and small, well packaged, good quality. Sounds are good but still sounds monoish. Speaker is very small, so easy to carry, self-powered with rechargeable battery. You can buy it under $20.

Specs:

360 degree sound field.
4-6 Hour Li-on battery charged by USB.
Output: 2.4W
Rating Power: 1.8W
Size: 50W X50L x35H (mm)
Speaker: 36mm micro speaker, 4Ohm
Frequency Response: 100Hz-20khz
Signal-to-Noise: >85dB
Distortion: <0.5%
Battery Voltage: 3.7V
Battery Capacity: 300MAH

Related posts:

1. Sonic Impact SoundPax Portable Flat-Fold Speakers The SoundPax portable speakers offer great sound that will get...
2. F-Driver F-500i – Make Your Window as Hi-Fi Speakers Freedom Driver(f-driver) is a new kind of speaker for MP3,...
3. Do you want other than Ipod, 4 GB MEIZU MEIZU 2.4" White 4 GB MEIZU Portable Video Player MiniPlayer...