Getting EINs for the foreign-owned LLCs

Hello, I'm looking for a pro to file e-file EIN applications for the LLCs owned by the foreigners (non-US residents). The proces itselt is smooth and easy but our clients have no SSN or ITIN which makes them unable to do it by themselves. Since our firm is swamped with other business services for them we need to hire an outsourcer. Please send your quotes per single filing.