While it isn't a bargain at $350, the Riva Audio Turbo X is one of the loudest and best sounding compact Bluetooth speakers available.
Whether you listen to death metal or nature documentaries, the Bowers and Wilkins B&W 685 S2s are an astoundingly good set of speakers and an excellent deal at this price level.
The Sonos Play:5 shrinks the Sonos streaming music experience down to a compact single-speaker system with great sound, which you can control from any iOS device or Android smartphone.
The Vestalife Ladybug is a suitable choice for iPod owners who want a stylish and reasonably compact portable speaker that can also be used in a dorm room or office.
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While the Denon S-52 is chock-full of impressive features, its subpar sound quality makes it hard to justify the steep asking price.
Nano owners who want to take their trusted player for a splash in the surf or a dip in the pool will be well suited by the H2O Audio for Nano.