The main costs are professional review of the letter and the credential position, the employer's own preparation, and travel. Government charges depend on the route used and should be read from the current USCIS fee schedule rather than from a figure quoted by a recruiter.
A short review early is the cheapest part of the process
The single most cost-effective step is having someone read the draft letter and the credential position before anything is issued. That is a contained piece of work and it prevents the expensive version of the problem, which is a letter already sent, a start date already announced, and a wording issue that now has to be explained rather than avoided. Ask an adviser to quote that review separately from any filing. On the employer's side, clarify who pays for what before the process begins; hospitality groups vary widely in what they cover, and the answer is easier to obtain during recruitment than after acceptance. Keep the quotes and their assumptions in writing.
Hypothetical example: Selim, a computer systems analyst, is offered relocation support but no written answer about document or legal-review costs. An opening assessment turns the offer into a cost sequence: credential records, employer letter, travel, government charges if applicable, and professional advice. The offer, reimbursement policy, and invoices settle who bears each item. Ask the employer to decide payment responsibility before anyone orders expedited documents or books travel. Costs often expand when a letter must be reissued after a qualification mismatch, or when an applicant pays for an unnecessary evidence track. A short, scoped review of the role and credential can therefore be more useful than a vague all-inclusive quote.