"Can I get them from any agency or only from the listed agencies on the IRS website?" Unless I misunderstand you, you get the certified copies from the agency that issued the original documents.
Perhaps you are referring to Certified Acceptance Agents or an IRS Taxpayer Assistance Center? It is convenient taking your W-7 and certified copies to either one, because that way, you don't have to mail your passport and other important documents and be without them for weeks.
Note that some CAAs may expect to file your 1040 at the same time (which may be OK with you).
Use this IRS webpage to see if there is a CAA or IRS Taxpayer Assistance center near you.
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