I use a Misto sprayer instead of cooking spray. It's really good for giving veggies a light olive oil glaze for roasting, spraying a light mist of oil on salad or meat, and spraying my pans before I stir fry. You know you're using a good quality oil, because you pick it and fill it yourself!
You can find Misto spray cans at Bed, Bath, and Beyond and online at Amazon. I've seen them occasionally at our local Target. I imagine any real kitchen supply store would stand a good chance of carrying them.