Thumb Score: 0
The C3 code for 40% off seems to be working for all three of these amps (even when not advertised on the 40% off sale).
Electric Guitar Amp (@$ 48):
https://eastar-music.com/products…d2bd
Bass Guitar Amp (@$ 57.60):
https://eastar-music.com/products…d2bd
Acoustic Guitar Amp (@$ 59.39):