Trulia and other sites like Zillow don't always update their systems as quickly as the MLS. The realtor MLS gets information directly from the various realtors and their agencies. A realtor is the best resource for what is really on the market, market statistics, and what the local real estate market is like. Invest in a good realtor and you will be well served.
Enjoy your day,
Phyllis Halstead, Oregon Real Estate Broker
Gateway Real Estate - On the Plaza