Del Rincon states that due to an expected influx of people coming in to take advantage of the Free Sales Tax holiday the I-94 permits department will have more officers available to assist Mexican tourists seeking to acquire a permit.

The permit cost approximately $6 and is good for one year.

What is an I-94? Form I-94, the Arrival-Departure Record Card, is a form used by U.S. Customs and Border Protection(CBP) intended to keep track of the arrival and departure to/from the United States of people who are not United States citizens or lawful permanent residents (except for those who are entering using the Visa Waiver Program or Compact of Free Association, using Border Crossing Cards, re-entering via automatic visa revalidation, or entering temporarily as crew members).[1]

While the form is usually issued by CBP at ports of entry or deferred inspection sites, USCIS can issue an equivalent as part of the Form I-797A approval notice for a Form I- 129 petition for an alien worker or a Form I-539application for extension of stay or change of status (in the case that the alien is already in the United States).