The Ultimate Ears Wonderboom 4 is certainly the best cheap Bluetooth speaker on this list, combining good sound with an ultraportable design and productive 360-diploma audio. It's just a straight-up Bluetooth speaker (so no Wi-Fi) however you can pair two of these together both in stereo or dual mono. https://www.bluetoothspeaker.top/new-product-transparent-outdoor-portable-mini-bluetooth-speaker-with-led-light/