Best Resale Market for Broadway at SAFE Credit Union Theater?

Does anyone know the best place to buy resale tickets for Frozen? I have a pair of tickets for the 1/14 show at 7:30, but I needed another pair of seats.

I bought seats directly on the website but now Frozen appears to be sold out for the 14th.

I was looking on StubHub and TickPick and prices are outrageous.