I wanted to add that there are several forms/types of Vipassana and several different types of centers that conduct retreats. Many people get confused and think that there is only one type of Vipassana.

The Insight Meditation Society (IMS) is located near Boston and is the most extensive center in the US.

“IMS offers Buddhist meditation retreats at two facilities – the Retreat Center and The Forest Refuge – in rural central Massachusetts. The Retreat Center is one of the two IMS centers in the United States. However, all Buddhist centers teach vipassana/vispashyana. It offers a full yearly schedule of more than 25 meditation courses, ranging in duration from a weekend to three months. Most retreats run for 7–9 days.”

https://en.wikipedia.org/wiki/Insight_Meditation_Society

Insight Meditation Society (IMS) uses a sliding scale to charge for its retreats and I have found them to be my favorite center for going on a retreat.