http://www.amazon.co.uk/Logitech-Mini-W ... 689&sr=8-4
Highly recommended little unit - really full sound for the size and goes pretty loud (if you blu tac it to something rigid). Battery lasts for hours and it'll BluTooth of your phone up to 5m or so.
Only downside is that you can't (or I can't!) make two work off the same BluTooth feed.
Should be able to get them for under £50 if you look around (I think there's a newer version out too).
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