JBL Charge 4 - Portable Bluetooth Speaker with built-in powerbank
Amazon.com: Volkano Wireless Bluetooth Speaker w/Microphone - Portable Speaker, Mini Boom Box Small Bluetooth Speakers for Outdoor, 10W True Wireless Sound FM Radio/SD Card Reader/USB/AUX - Black, Stun Series : Sports &
Ultimate Ears' ROLL 2 Waterproof Bluetooth Speaker is just $55, more