$29.99 for Veho 360-Degree M4 Bluetooth Wireless Speaker ($69.95 List Price)

Roughly half the size of a can of soda, the ultracompact speaker pumps out 4.4 total watts of sound despite its size. It foregoes the need for audio cables, giving a voice to smartphones, tablets, or laptops with a Bluetooth connection. A microSD card slot turns the speaker into a standalone MP3 player. With a single charge of the speaker’s lithium-ion battery, it can pump out tunes for up to five continuous hours or 1,190 refrains of "The Song That Never Ends."

Two 2.2-watt speakers
Compatible with all Bluetooth devices
Compact, portable device
10-meter Bluetooth range
Deep, rich sound
3.5mm headphone jack for use with non-Bluetooth devices
Up to five continuous hours of playback
Lithium-ion rechargeable battery
MicroSD card slot turns the speaker into a standalone MP3 player
Embedded volume and track control