Question about car stereo installation

I recently purchased a subwoofer, two amps, speakers, and wire from a friend and we have everything installed except for the subwoofer. So basically we dont have much installed -_-

However they say that I need something called a mounting kit (or an installation kit?) in order to wire the subs to the deck (CD player thing). How much would one of these kits cost?

please help, thanks.

i dont think anyone here spends money on cars..

Maybe you could try a car modding forum. Either that or glue.