http://www.funda.nl/koop/ is (if I understand it correctly) shows all properties for sale through NVM members (Dutch association of makelaars, that realtors to you). It's in dutch but it's reasonably obvious how it works. Online translator such as Babelfish will help you learn key words.
My house is funded by a mortgage (hypotheek) from one of the main banks (ABN Amro). It was arranged by my employer so I don't know how difficult it is for a foreigner to arrange it independently.
Good luck.
