Single return JR Pass Tokyo/Nagoya/Tokyo

I will be visiting Tokyo for 3 days and Nagoya for two days. I intend to buy To kyo Subway 72hrs pass for Yen1500 and understand it can be used only on Tokyo Metro Line and Toei Line. Correct me if I am wrong. I would like to know:-
1) how much is the single return fare traveling from Tokyo/Nagoya/Tokyo by Shinkansen Hikari?
2) Where can I buy the ticket as this is not the JR 7 day pass.

Thank you