You need to use a bridge rectifier to convert A/C to D/C and a dropping resistor to bring down the voltage to a useable level. Not to hard to do but you need to mount it somehow with it shorting out any thing else under the playfield.

100 dollar board to replace a dollars worth of parts.

You can move the wire on the service outlet that's already there to the switched side. Then the outlet will come on when you turn on the power switch. That's how I power a 12volt P/S for my under cabinet lights.