New Baneshwor--$400 is expensive--Find out the Doctor's in your area and give them a call and ask.If you are in VA area, you can get it done for aorund $200.

Please visit this link to find Doctor's office near you.
https://egov.uscis.gov/crisgwi/go?action=offices.type&OfficeLocator.office_type=CIV