Ask which company records and explanatory work are needed for the actual claim. Separate that preparation and legal assessment from official filing fees, optional processing services and any family applications.
Avoid paying for an unsupported narrative
The company should identify the people who can verify the knowledge and assignment before commissioning a lengthy description. Clarify whether the professional scope includes reviewing confidential evidence, offsite arrangements or later government questions. Confirm current charges for the specific employer and filing. A more elaborate narrative cannot create a fact the underlying records do not support.
Beyond the Form I-129 filing fee and any associated fees at the amounts in the USCIS fee schedule, Form G-1055, the real expenditure is internal time spent extracting training records, version histories and approval trails, plus professional fees for preparing a statement that survives scrutiny. Someone has to identify the proprietary process precisely, retrieve training and validation records that may be on a shared drive nobody has curated, and describe technical material in language a non-specialist reviewer can follow. The larger real cost in a systems case is usually the work of documenting something that was built informally: writing up the architecture, gathering repository history into a coherent exhibit, and drafting a duty description for the receiving role.