If you truly mean you don't want to go to a Realtor, you will NOT want to go to Realtor.com, many local MLS realestate company or individual agent's sites, because most of those are Realtor owned sites that have lots of good information provided to the public for free. If what you mean is that you don't want to risk anyone calling or emailing back to you, and maybe 'bugging' you , your choices are a little more limited.
Incidentally, do you know that not all real estate agents are REALTORS? A Realtor is a realestate sales agent who has chosen to join the Natoinal Association of Realtors, a trade organization, and be held accountable to the Realtor code of ethics, among other things.
I am a real estate sales person who has chosen to stand by the higher standard that is rquired of carrying the name REALTOR and these are some of the places that I look- but be prepared. It will take some time and energy.
You might check these out:
-the courthouse in the county where you are looking, and reasearch the deeds or other county records.(if it is real estate that has been 'sold' it should be in the public record.
-ask at the boro or town office where to find those records
-call the appartment complexes that you see in the area and ask if they have sold any apts recently, or have any for sale.
-go ckeck the (online or hardcopy) local newspapers classifieds and follow up with any that seem to have been sold.
Hope that helps