There is a company called "Three Wide" http://(www.threewide.com
) and they take your MRIS listings and automatically upload them on a number of websites including Trulia. They have a product called "ListHub". ListHub will provide a seamless flow of data from MRIS to popular Internet sites with one click and no re-entry of data. Brokers will control which sites display their listings and track the traffic generated from these sites back to their own website. ListHub keeps the data accurate and up-to-date.
It is a subsciption service but you can get the office broker to subscribe and divide up the cost amongst all office agents.