the Banks LIST them with Realtors for sale.
To find these and make an Offer, you need to contact a Realtor to represent you.
These Buyers Agents are free to you, the banks pay the commission.
But you have to have a Realtor in your corner.
You find some good ones listed here on Trulia:
The contributors to Trulia are good concerned Agents who want to help.
On the bottom right, look for VIEW A VIP or some such verbage
Click on it and enter QUEENS, NY and you will see a long list of Agents.
You can search their EXPERIENCE, PROFILE and RECOMMENDATIONS.
Good luck and may God bless