It's only a fifteen minute walk from Penn Station to Union Square, so if it's a nice day, you could save the subway ride.
The train from Suffern is only 10$ Peak, so I'm sure it's cheaper off-peak. The train from Tarrytown is 7.25 off-peak (5$ TZ toll).
The bus from Nyack is less than 8$ (I buy bulk, so I don't know exactly)- and that drops you off ten minutes from the herald square store, at port authority.
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The train from Suffern is only 10$ Peak, so I'm sure it's cheaper off-peak. The train from Tarrytown is 7.25 off-peak (5$ TZ toll).
The bus from Nyack is less than 8$ (I buy bulk, so I don't know exactly)- and that drops you off ten minutes from the herald square store, at port authority.