score:7
There is bellen.com, but unfortunately Dutch only. The list of prepaid providers with Internet can be found here. It is in Dutch, but I hope the following translation of the table fields can help:
Aanbieder = Provider
Pakket = Package or Plan
Databundel = Data bundle (amount of Mb you can use for free)
Buitenbundel = what you pay if you go over your "Databundel"
Snelheid = speed
Prijs p/mnd = Price per month
Not all are prepaid. When it is, it is mentioned in the column "Pakket". Ignore Rabomobiel, Rabobank is a dutch bank and only available for bank customers.