I agree with Jeanne in that you should find an agent that is resourceful, tech savvy and an agent that understand your wants and needs. Are you just looking to buy, sell or both?
The type of information you are looking for can be found on Trulia. On Trulia's main page, I typed in my home address, which has a public record of when I purchased it, which was within the past 4 years (not sure if trulia documents sales from up to 4 years ago or 25 years ago). I believe that since Trulia is tied into the Multiple Listing Service (MLS), which houses sales from 12 years ago, it might find recent sales data from within that time frame 1-12 years.
In any case, once you type in your address, click on recently sold tab, then look for the tiny link that says view details and then click on the tab that says comparables.
This is one way, but a more reliable way would be to allow my company to provide you with a free miniCMA based on details you provide over the phone, face to face or by email of which over the phone and face to face is more reliable than email, but I can comply with your wishes.
Have a good day!