Some of the mods I have done are
*Illuminated out hole (blue LED strip) approx $5 AUD
*Illuminated crane (blue LED strips) approx $5 AUD
*Illuminated shoot lane (red LED strip run from the shoot button light) approx $5 AUD
*Angle eye thumb switches approx $4 AUD
*Illuminated ball eject shield (red) approx $3 AUD
The costs are not including my labor, I do this for fun!
Considering the underworld, shute/ball popper and Simon escape for illumination.