The Form I-129 fee and any associated fees appear in the USCIS fee schedule, Form G-1055, and are the predictable part. The unpredictable part is internal time spent retrieving protocols, version histories and training records from systems nobody has queried in years, plus professional fees for a statement that survives scrutiny.
Evidence assembly is a project, and it should be scheduled like one
Somebody has to pull completion records out of the training system, export document histories from wherever protocols are kept, retrieve change approvals, and produce a defensible headcount. In a small distillery that somebody is usually the person also running production. Treating the work as a project with an owner and a deadline costs less than squeezing it around a season.
Petitions in this category draw requests for further evidence more often than most, which makes a thorough first filing cheaper than a thin one plus a response written against the clock. Add professional fees, relocation, accommodation, health coverage and the family's applications. One offsetting benefit is worth noting: the statement and its exhibits, once assembled and kept current, become a reusable internal record for the group's next transfer and for its own quality documentation.