Government charges depend on the route: an admission fee at the port of entry, or the I-129 filing fee if the employer petitions. Professional fees, credential translation and travel are separate. Check current amounts on the USCIS fee schedule rather than relying on a quoted figure.
Price the route you chose, not the one in a brochure
Two TN applicants with identical credentials can have very different budgets depending on how they apply. A Canadian citizen presenting at a port of entry pays a modest admission charge; an employer filing Form I-129 pays a filing fee and, if it wants a faster decision, a premium processing fee, both set on the USCIS G-1055 schedule. Beyond government charges, a Boischatel applicant may need a certified translation of a French-language diploma, and possibly a credential evaluation if the profession's rule requires an equivalency finding.
Ask any professional adviser whether the quote covers the letter drafting only, or also the reply if an officer asks for more. Do not fold a spouse's or child's TD costs into the principal's line; they are separate people with separate charges. Keep receipts, because an employer that agreed to reimburse will ask for them.