Hi, i just came across a $30 coupon for a Philips Norelco SensoTouch/3D Razor. The 3D razors and the sensotouch razors usually are $100+ but i noticed the phillips norelco razors aren't that expensive which would make this razor really cheap, does anyone know if this coupon is just for the sensotouch/3d razors, or i can use them on regular philips razors? or do the more expensive razors go on sale?