Amazon.com: Anker SoundCore Rave Neo Bluetooth Speaker A3395Z11 Colossal Sound 50W Waterproof IPX7 18Huour Playtime- Black (Renewed) : Electronics
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Amazon.com: Anker Soundcore Mini, Super-Portable Bluetooth Speaker with FM Radio, 15-Hour Playtime, 66 ft Bluetooth Range, Enhanced Bass, Noise-Cancelling Microphone - Black : Electronics
Anker's Soundcore Bluetooth speaker is a reasonable $22 on Amazon right now
Amazon.com: Upgraded, Anker Soundcore Bluetooth Speaker with IPX5 Waterproof, Stereo Sound, 24H Playtime, Portable Wireless Speaker for iPhone, Samsung and More : Electronics