The Ultimate Ears Wonderboom 4 is undoubtedly the best cheap Bluetooth speaker on this list, combining good sound with an ultraportable design and helpful 360-degree audio. It's just a straight-up Bluetooth speaker (so no Wi-Fi) however you can pair two of them together either in stereo or dual mono. https://www.bluetoothspeaker.top/multifunctional-wireless-desktop-subwoofer-dual-speaker-with-cool-colorful-light-sound/