The PMP exam fee can vary based on the mode of exam.
The current fee for a non-PMI member going for CBT is 555 USD whereas for a PMI member it is just 405 USD.
Similarly, the exam fee for a non-PMI member opting PBT is 400 USD whereas for a PMI member it is just 250 USD. But, you can apply for a PBT only if you stay within a radius of 300 km from your nearest Prometric center or if the PMP® examination is sponsored by your employer for the employees within the organization.
For more information refer https://www.edureka.co/blog/pmp-exam-all-you-need-to-know/#pmpexamfee