Use Newegg coupon code JBLOTMX28
Newegg.com has this JBL On Tour Micro Ultra-Portable Loudspeaker on sale for $39.99 after instant savings. Add the coupon code, and the price drops to $19.99. As a comparison, Amazon.com sells it for $45.
This speaker has a second audio input for daisy-chaining speakers, has 2.2W of power and is compatible with iPod. Shipping is free.