The official TOP25 raster maps of The Netherlands can be obtained from here:
1. https://www.pdok.nl/nl/producten/pdok-downloads/basis-registratie-topografie/topraster/top25raster-downloads
2. http://mirror.openstreetmap.nl/kadaster/Top25/.
TOP25 rasterfiles are open data. This means: no costs and provided under license CC-BY-SA 3.0.
You can convert the Dutch 'TOP25' raster maps to Oruxmaps format (I did that 2 years ago, but cannot remember exactly how, it was not difficult).
The best vector map for The Netherlands (OSM) can be found here:
http://www.openandromaps.org/en/downloads/europe