Are you sure the rotors are responsible? Check for tires out of round, or poor wheel balancing. Also check thrust angle on wheel alignment. Any of these can also cause shaking.
Most common cause is warped rotors.
Have the front rotors turned on a lathe at a dealership. check brakes and rotors
warped brake rotors, have them resurfaced.
warped rotors
If it's only during stopping, I'd say warped rotors. Have the rotors and pads checked out.
One or more of the brake rotors are warped from heat, caused by braking. Riding the brakes or always being on them, are usually the cause.
Check the lug nuts
The most likely cause is one or more warped brake rotors, other causes can come from bad brake pads if the shaking is at very low speeds.
Warped rotors is the most likely cause. Seek professional help.
If you notice shaking as you apply the brakes this is generally caused by warped brake rotors. This happens as the brake rotors wears. Sometimes people take shortcuts by just replacing the brake pads and machining the rotors but as the rotor becomes thinner it cannot absorb the high heat that they operate in. Most likely this is the problem.
Rotors out of round - resurface or replace