About five years ago, making a lot less than the regional captain’s make today, I laid out $400-$500 (can’t remember exactly how much). To this day it is the best money I have ever spent in my life.
You are trying to get a job that will pay you millions of dollars. I know it seems like a lot right now, but if it is the difference of getting a TBNT and getting the job (which it likely would have been in my case), it is a small price to pay.
Invest in yourself!