The Ultimate Ears Wonderboom four is certainly the best cheap Bluetooth speaker on this list, combining good sound with an ultraportable design and effective 360-degree audio. It's just a straight-up Bluetooth speaker (so no Wi-Fi) however, you can pair two of them together possibly in stereo or dual mono. https://www.bluetoothspeaker.top/wireless-speaker-outdoor-subwoofer-with-led-flashing-colorful-metal-bass-speaker/