I didn't check for different websites offering application for ESTA. If I did, I would find the official website (esta.cbp.dhs.gov) where ESTA costs $21 instead of $129 on usimmigrationassistance.org. Although crazy expensive, they did what they promised in less than a day and I confirmed on the official website that my ESTA was approved.usimmigrationassistance.org put on their website that they are NOT affiliated with US government - which is honest. I wish they also honestly wrote their price in advance and the comparison of ESTA prices between them and the official site, so that the customers have this knowledge before they proceed to payment.
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