Trying to confirm internal and is running from Jost to red hook on fridays

Assume you are talking about Inter Island?

If yes, they are running Friday, Saturday, Sunday. We took them out of Jost on Sunday at 9 am. It was a quick trip to Red Hook. We cleared customs, reboarded the ferry and were taken to St John. $80 one way + $20 BVI departure tax per person.

Yes Interisland - did you buy on line?

no, we just paid at the ferry dock. There were 10 people total that were paying customers on the ferry that morning from Jost, three continued onto St John and 7 exited at Red Hook.