Copies themselves rarely cost much. Where fees arise, it is usually for re-obtaining originals, certified copies, or translations that were never provided to the applicant. Secure storage is inexpensive compared with reconstructing a file years later.
Pay once for documents you will need again
Credential documents, translations, and civil records tend to be needed more than once, at an extension, at a change of employer, or in a later application. Obtaining a clean copy now and storing it properly avoids repeat ordering from institutions that can be slow to respond. Note that a translation and a credential evaluation are different services, and holding one does not mean the other exists.
The government fee for the route chosen appears in the USCIS fee schedule and is often paid by the employer for a petition, while a border application charge is usually paid by the applicant. Professional fees, transcripts, translations and travel are separate lines and should be quoted for this profession, not generically. Licence verification, examinations and credential evaluation are usually the larger and slower expenditure, and none of it is an immigration cost.