Most sitting groups meet on a regular basis and most offer instruction and/ or retreats to support your practice.
They are either free or request a donation to support the group/rent/work.
See these links below for local meditation groups in the NY Metro Area.
Finding Local Sanghas/Sitting Groups
Thich Nhat Hanh/Plum Village Tradition
New York Metro http://www.communityofmindfulnessnewyorkmetro.blogspot.com
USA/Canada and worldwide: www.iamhome.org
Blue Cliff Monastery http://bluecliffmonastery.org
NY Insight http://www.nyimc.org
Vispassana Meditation (Goenka) http://www.dhamma.org/
The Interdependence Project http://www.theidproject.org
Wake Up! https://www.facebook.com/groups/wakeupny