Thanks for your amplification about relocating to Marin.
http://www.HousingMaps.com is a mashup app of CraigsList.org and maps.google.com. Select "SF - North Bay" and...
Zoom in then move south a bit. Change from "Map" to "Hybrid".
This Rental Map of the North Bay is a great tool. You can use it as a FSBO source when buying as well.
http://maps.google.com has a similar capability - different database. Together... You've got it covered.
I recommend adding Sausalito since you're planning on moving again anyway. Then you can find the cutest place available within your price range to begin your quest.
When you're ready to consider buying the MLS, where REALTORSÂ® post their listings, the brunt of the market, http://www.Great Homes.org is the official site but almost every agent/broker has a version on their website - I do.