You could look on ebay or other sites . If you really want to save some cash buy 8 ,10 ,or 12 in vinyl rolls and use that . It's all you get when buying the kit from any of the trusted sites . I bought mine from AM but they use the same material. The only difference is it comes pre masked two inches apart. But on these new cars with the curves you have to make the stripes crooked to make them look straight Sounds crazy but ask anyone who has done their own .
Just make sure the vinyl is good quality like 3M and made for outdoor use.