Hello cbbain,
I think you are doing what you can do. If he doesn't like the properties currently on the MLS, then you will have to either go door knocking or send out mailers. This is going to get you people that want to sell but for unreasonable prices and your buyer doesn't seem to want to mess with that business. So, the only hope you have, is to wait it out for properties to come on the MLS.
You can also call other agents in your area and give them the criteria to be looking out for a property that fits the description. Agents know people want to move before they do.
