Wiring Up a Power Amp and Sub Woofer, pre existing hot wires? Options

[Lexicon_Devil]

I'm in the process of taking my small, alpine power amp and sub box
and wiring it up to my Celica. My stock amp is already bypassed and
the car is pushing the six speakers from the head unit.

I'll be using the RCA outs of my head unit for the inputs on the amp.

My question is -

Are there any wires down there that are already "hot n ready" for the
amp? Or will I need to run new wiring? I need power and a ground.
I don't want to cut into my head unit. Want the amp and woofer to be
independent.

Thanks guys.

By the way, I already have the console tore apart. I'm just lookin' for
a possible tip. Haven't played with it since I installed the head unit in
2003.