How much does it cost to fix 2 deep scratches on a car?

I don't know when or how it happened but this morning as I was taking in groceries from out of my car, I noticed what looked like dirt/mud from all the dirt and snow around in this New England weather. As I went to wipe it away, I realized it was not dirt and it was paint scratched off my car. There are 2 of them one on top of the other about an 1/2 inch apart from each othet, and probably an inch long. It looks like someone might have done it on purpose for I am choosy where I park and how I park so I figured someone might had done it out of spite knowing I try to keep the body of my car in good condition since I bought it a year ago and like to keep it nice. I just want to know where is the best place to fix it and how much does it generally cost to have it fixed without it costing me an arm and a leg.