You've received good answers below. I encourage you to check out the link below to visit our Find a Pro directory. There you can search for professionals who specialize in the area you're interested in and review their activity on Trulia and recommendations to find someone you might want to reach out to for help.
Not sure why agents aren't responding, however if you are looking to purchase in the near future, it's really in your best interest to work with an agent of your own; he/she can provide any necessary information, provide suitable listings, schedule showings, etc.
Suggestion: Get an agent of your own, rather than peppering random agents with inquiries. That'll do two things: (1) establish a closer relationship, thereby increasing the likelihood of a response; and (2) protect you, since you'll have your own agent and not risk dealing with the listing agent.