bol.com was available in the past but because they completely changed their datafeed system they are no longer available.
More info: http://www.datafeedr.com/forums/showthread.php?t=10734
We have a custom products feature allowing members to add products from merchants not available in Datafeedr.
This is a manual process. In other words you have to add the products manually one by one and maintain the products yourself. Depending on the number of products you're missing this may work for you or not.
The feature is explained in this video http://www.datafeedr.com/videos/?vid...rc=yt#videotop