Amazon.com: Facmogu 2PCS 8 Inch Full Range Audio Speakers, RMS 50W Peak 120W 4 Ohm, Car Vehicle Audio Full Range Drivers, Wide Range Bass Woofer DIY Loudspeaker Replacement - Yellow : Electronics
2Pcs 3 Inch Sound Music Full Range Speaker Driver 8 Ohm 15W Loudspeaker Units DIY Home Amplifier Speaker Sound System(Square 8 Ohm Speaker) - Newegg.com
Stereo Enclosed Speaker Set - 3W 4 Ohm : ID 1669 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Ohm Acoustics | Brooklyn NY
Ohm Acoustics Loudspeakers: The Budget Audiophiler - ecoustics.com