The government charge depends on the route: fees collected at the port of entry for an in-person application, or the USCIS filing fee if the employer petitions on Form I-129. Current amounts are published in the USCIS fee schedule, Form G-1055.
The government fee is the small line; the evidence is the real cost
Quote the fee schedule rather than a number someone remembers, because the amounts change and the applicable ones depend on the route and on the employer. Around that fee sit costs that matter more to the outcome. An official transcript carries a small charge.
A credential evaluation, if any degree came from outside Canada, Mexico or the United States, costs more and takes time. Certified translations are priced per page. An adviser's time reviewing the support letter and the employment agreement is usually the largest professional item, and it is the one that prevents an expensive refusal.
Wendy should also ask the employer in writing which of these it will pay, since companies that cover a petition fee often do not cover the applicant's travel, credential work or a dependant's application. A refused entry at a port carries no refund and is recorded.