So-called Immigration Consultants, Notary Publics, Travel Agents and Employment Consultants are NOT allowed to charge fees for immigration services, because the law forbids it. Non-attorneys assume that a cookie cutter approach to completing applications always applies. They also have knowingly or recklessly committed fraud in preparing applications, which can result in your deportation. The U.S. government never actively enforced the unauthorized immigration practice laws. If the questions are answered improperly and evidence is missing, then your application is denied.
Applicants can trigger deportation orders, when they file applications.
You are forewarned that you may not get such a bargain. Attorneys or others who make guarantees or claim that they have some inside track. This is especially true, because INS agents are audited by the Inspector Generals Office for inconsistent patterns of adjudication. The auditing process can pick up patterns of fraud or negligence by an examiner. The launching of investigations are unpredictable.