The Ultimate Ears Wonderboom four is definitely the best cheap Bluetooth speaker on this list, combining good sound with an ultraportable design and powerful 360-degree 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/top-sell-wireless-bluetooth-speaker-portable-outdoor-bluetooth-speaker-with-rgb-light/