You did exactly what your supposed to do... ask the question on Trulia! Many of the agents who answer your question will be able to help you. You can also comb the neighborhood looking for "for sale" signs in the area or research agents further online.
When considering a buyers broker keep in mind the following:
1) Are you going to pay the buyer broker's fee or did you want that to be paid by the seller of the home you are purchasing?
2) Are you willing to commit yourself in writing to a single buyer's broker?
3) Would it be more beneficial for you to not limit yourself and work with many different agents?
Your answers to these questions can make it easier or more difficult to make your deal. You need to think about that. If you want, contact me direct and I can give you a bunch of good pointers and/or represent you as a buyer's broker.
Mitchell S. Feldman
Associate Broker/ Director of Sales
Madison Estates & Properties, Inc.
Office: (718) 645-1665/ Cell: (917) 805-0783