Stereo 3.7W Class D Audio Amplifier - MAX98306 : ID 987 : $8.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: LEIGESAUDIO 0 Gauge Amp Wiring Kit Complete 0 AWG Amplifier Installation Wiring Kit - Car Subwoofer Wiring Kit Helps You Make Connections and Brings Power to Your Radio, Subwoofer and Speakers : Electronics