The Form I-129 filing fee with the L supplement, plus any premium processing, at the amounts published in the USCIS fee schedule, Form G-1055; consular fees if a visa is then required; and professional costs for counsel, for assembling corporate evidence and for any accounting work needed to document the relationship between the entities.
Most of the spend is assembling evidence the group has never had to produce before
Government charges are published and predictable, and Form G-1055 is the reference to use because the amounts are periodically revised. What surprises small operators is the internal cost. A group that has never filed anything of this kind may have incomplete minute books, an unrecorded share transfer or a holding company nobody has updated since incorporation, and putting that right involves a corporate lawyer and an accountant before an immigration filing can even be drafted.
Preparing two organizational charts with duty descriptions takes management time. Where premium processing is used to meet a season opening, the fee is real and appears in the same schedule. If the petition is approved and Bertrand then needs a visa, consular fees and an appointment apply on top.
Set against those figures, the cost of drafting the petition around the wrong theory of managerial capacity, and having to answer a request for evidence in mid-season, is the one worth avoiding.