Adafruit 4227 Mini Oval Speaker with Short Wires - 8 Ohm 1 Watt: Amazon.com: Industrial & Scientific
Amazon.com: Pack of 2 Full Range Bookshelf Speaker, 3 Inch 8 Ohm Anti-Magnetic HiFi Tweeter Wooden Enclosure Home Audio Woofer Multimedia Speakers (8Ω) : Electronics