Better to just work with the listing agent if possible in this situation. Contact a few listing agents for your target properties. Discover which are friendly, responsive, fast and seem sharp. Discuss with them the possibility of them representing you in the transaction and leave open the possibility that they can find another property for you or suggest another one of their current or upcoming listings. let them know exactly what you are looking for and they can help you tremendously. That's the route I would take. Good luck!