I dont exactly know of a wire that does that but if you wanna make a wire that only works with they key off then hook a relay to your ignition using the ignition for ground on the relay then when you turn the car off the relay will energize.

ignition to 85
constant power to 86 and 87
power output when ignition off to 30
nothing to 87a

the reason that works is because when the ignition is off it rests on ground.

Hope I Helped!!!!!!!