The Ultimate Ears Wonderboom four is definitely the best cheap Bluetooth speaker on this list, combining good sound with an ultraportable design and efficient 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/wireless-bluetooth-speaker-usb-stereo-sound-music-box-transparent-fashion-battery/