You should have the ability to contact the agent directly through any number of methods including Realtor.com, or the like. However, you may want to strongly consider the interviewing and hiring a buyer's agent. A good BA is a HUGE benefit and no cost to you. Feel free to read the FAQ in the buyers section of our website to learn about how it works(Go to Property>buyers>FAQ). Also, keep in mind it's usually best to find a buyers agent who regularly works (and even maybe lives) in the neighborhood you are looking. For instance, what does someone from Acton, MA know about Waltham? Probably not that much.