This particular course, SANS 588, has assembled 6 sections all on areas of pentesting I am most interested in learning, on account of all my prior work in the past as a DevSecOps engineer.

These subjects are what I want to study, but the hefty price tag of approx 9000 dollars is pretty crazy, and I don't have a company to pay for it. Are there any other worthwhile and reputable providers of this kind of education or certification?