The Ultimate Ears Wonderboom four is definitely 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) but you can pair two of them together possibly in stereo or dual mono. https://www.bluetoothspeaker.top/wireless-speaker-bass-loud-stereo-led-flashing-light-waterproof-outdoor-bluetooth-speaker/