Yes the shop tripodjw has said is pretty good, got the Mission Impossible box set cheaper there than anywhere else but for single discs they were quite a bit more expensive than other shops I found.
There is a shop near Radio City, face radio city and walk left one block and they have a decent selection of Blu Rays but sorry I cant remember the name.
Circuit City on Union Square was still the best I found though, huge selection and quite a bit cheaper than anywhere else
Loads of places were selling then when we were there over Christmas so even more must be now.