So we actually found a dance studio in Rockland! FI's friend went here before his wedding. It's NY DanceSport in New City:
http://www.dancerockland.com/
FI really wants to take a lesson, so i think we are going to do it! It says you get a 30 min free introductory lesson, and then one private lesson is $65 and group lessons are $57. I haven't talked to FI yet, but I think we'll end up doing the one private lesson. I can't see FI wanting to go to 10 dance classes with other people around lol, but I never know with him! HTH