Cheapest so far I think for this speaker.
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Description from the page
Make every day an adventure with the incredible sounds from the small and portable UE black WONDERBOOM wireless Bluetooth speaker. Take in 360-degree big bass sound with a 10 hour battery life for non-stop fun from every direction. With an IP67 waterproof and dustproof construction you can throw it in the pool for up to 30 minutes and it'll continue to blast your playlist loud and clear, or if it gets dirty after a day of bike riding simply rinse it off. Plus, the rugged WONDERBOOM features a hanging loop for attaching to a backpack or bike to put more fun into any adventure, and it has even been drop proof tested from up to five feet to withstand your more wild antics. Party without your phone attached to you with up to a 33-metre wireless range. Pair the UE Wonderboom to up to eight Bluetooth enabled devices, connect up to two source devices at the same time for one hell of a playlist, or wirelessly stream from your Bluetooth enabled smartphone or tablet to two WONDERBOOMs to amplify your favourite tracks. Make a splash with the UE Wonderboom portable Bluetooth speaker.
Torn between this and the Flip 4, leaning more to the flip 4 for sound quality though. The Wonderboom 2 is out in the US already