I got mine at TCP Global ...
http://www.tcpglobal.com/pinstriperd...sdfinesse.aspx
They also have paint, brushes and whatever else you may need. I did not have any luck locally but I live in a very small town. You could also do your curves by using 3M fine line tape. It is flexible and will make the corners with effort but you need to tape each side of the stripe separately.
Good luck.