Speaker - 3 Diameter - 8 Ohm 1 Watt : ID 1313 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
4 Inch Full Range Speaker Neodymium | Full Range Speaker 8 Inches - 20-40w 5.25 Inch - Aliexpress
Amazon.com: Pioneer TS-M800PRO 8-Inch PRO Series High Efficiency Mid-Bass Car Speaker Drivers - Pair (Discontinued by Manufacturer), Black : Electronics
MISCO Speakers | 3" Waterproof Full Range Speaker - 93113