The government charges depend on whether the applicant applies at a port of entry or the employer files a petition. Current amounts are published in the USCIS fee schedule and should be checked at the time of filing.
Look up the charge rather than budgeting from a remembered figure
Hypothetical example: There are two routes and they cost differently. A Canadian citizen presenting at a port of entry pays the charge applicable to that application at the border. An employer that prefers certainty may instead file Form I-129 with USCIS, which carries the petition filing charge and, if the employer chooses it, an optional premium processing charge.
All of these are published in the USCIS fee schedule, which is the only figure worth relying on because amounts change. Beyond government charges, budget for the credential evaluation if a degree was earned outside North America, for professional advice, and for the state licence or registration if the profession requires one. Note that none of these payments create eligibility.
Paying a premium charge buys a faster decision, not a better one, and a file with a weak profession argument fails faster rather than differently.