All agencies have a contract to provide A320 crews for HVN. So you have the choice. There is no single provider for this contract as all agencies are struggeling to provide the required crews.
I will have a look for the contact details of the "local" agency. But be aware that this agency is brand new. They put a letter in each Airbus pilot's mailbox in April when the Airbus contract was up for renewal. This letter was not very nice and was proof that they don't know the market.
I will post the details when I get hold of them.