I just bought this small bluetooth speaker (3.8 x 2.6 x 2.6 inches) made by Aukey because it has good reviews and is on sale for $6.88 when you use code FORMOM22. It's regularly $16. It comes with a built-in mic so you can use it as a speakerphone, too. It comes with a micro USB to 3.5mm audio cable so you can use it without Bluetooth, too.
