Ok first of all tampons are NOT reusable!
Second, where the hell was your g/f that she had to have you run them over to her right at that very moment?
Third, I say make her pay at least half for being a ditz and leaving them somewhere when she knew she would need them, AND for not having at least one spare on her person at that time of the month!!!!!
Fourth, you pay the other half b/c you were the dumbass that was speeding. How you gonna explain to someone's family you injured or killed their loved one b/c you had to run a tampon to your g/f??
Lastly, call your g/f over and have her tell the story to your parents so they can see how stupid you two are together. They'll decide you two should spend some time apart, and you can still have your car for spring break!
ps. dude just pay the ticket and learn your lesson! Take a class if available to keep insurance down and points off your license