I did the same thing last year. I rear-ended some girl at about 5 mph while leaving school. We didn't call the cops or exchange insurance info. I just told her that I'd pay for it all, whatever it costs. She went to get an estimate and it came out to $105. She was driving a 2003 Hyundai Elantra or something... I put a couple little scratches on her bumper from where I hit her. I don't remember the name of the shop that she took it to right off the top of my head but I have a copy of the reciept still. So if you want to know the name of the shop she took it to then just let me know and I'll go dig out the reciept.