I just got the stuff from a local body shop paint store. I think I paid like $40something for a pint of it. I do think its worth the money though, especially on something like an older vehicle that you are trying to preserve. But you know what, im an idiot! haha. i jsut realized you were asking about rust bullet, the stuff I use is called por-15. i have heard good things of rust bullet though, just have not used it personally. Sorry for the confusion! The reason i did not use rust bullet is you can only get it in silver, so unless you want a silver undercarriage you hafta paint over it. You can get por-15 in different collors of black anyway including an oem chassis black. I used the regular black first and then went over that with the chassis paint.