Amazon.com: CQRobot Speaker 5 Watt 8 Ohm Compatible with Arduino Motherboard, JST-PH2.0 Interface. It is Ideal for a Variety of Small Electronic Projects. : Electronics
3-Inch Speaker 8 Ohm 1 Watt - RobotShop
3 Inch Subwoofer Speaker 4 ohm 10W Germany S& H3 Long Stroke Bass Loudspeaker For Home Theater Audio DIY Parts 2PCS - AliExpress
R 10 S - 8 Ohm
Speaker - 3 Diameter - 4 Ohm 3 Watt : ID 1314 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
3-Inch Speaker 4 Ohm 3 Watt - RobotShop
3 Inch Subwoofer Speaker 4 ohm 10W Germany S& H3 Long Stroke Bass Loudspeaker For Home Theater Audio DIY Parts 2PCS - AliExpress