Today, March 31 only, Amazon is offering up to 80% off select Oontz Portable Bluetooth Speakers.  This sale includes this HIGHLY rated Cambridge SoundWorks OontZ Angle Enhanced Edition Ultra Portable Wireless Bluetooth Speaker for just $19.99 (reg. $99.99!). Or this Cambridge SoundWorks OontZ Angle PLUS IPX-5 Waterproof Ultra Portable Wireless Bluetooth Speaker for $34.99 (reg. $129.99!).  Even better, you can snag FREE shipping with a $35 order or FREE 2-day shipping with Amazon Prime.