Comment by Etheryte

You're right in that most listings eventually end up on sites such as Funda, Pararius etc. However, almost all offers go online on an agent website first, oftentimes considerably so. Your milage will vary of course, personally I started using agent sites after calling an ad that had been up on Pararius for 5 minutes yielded the response that the viewing list is already full. Turned out it had already been up on the agent page for a day and well-priced offers go fast in desirable areas. It is worth noting that I live in a very contested area, I would hope life is better in smaller places.