There’s a good chance most travelers will be carrying an iPod or other MP3 player wherever they go. To get a party going wherever you may be, an iPod Boom Box might be a good idea. The Griffin Technology Journi is a good candidate. You can buy it for under $100. It has a rechargeable battery that lasts for 8 – 10 hours on a charge it can also be powered by a USB port and gets good user reviews. Altec Lansing has the inMotion iM600 for around $100. It gets very good user reviews, uses some engineering tricks to make the speakers seem further apart, and even has an FM radio built in.