I haven't found the costs for using GPRS abroad on a Orange NL sim.. Where on their web site can these prices be found?

It should be ?3/MB as I listed on this site, but our page here is quite old.

That must be the national price - what I'm after is the gprs price when roaming.

But why are you looking for GPRS roaming tariffs all over Europe? There's 1 best solution, and that's Wind, all the others offer pay-per-use GPRS in very few countries with prepaid and at a very high cost.

I have a Wind sim already, but haven't activated the gprs bundles yet...

A few questions about wind gprs:

1) Can i activate the mega no limit etc from the 155.it, and not pay ?0.50 charge there is when activating per sms?

2) Do I have to deactivate an older subscription of another gprs plan if I had it before, and have it out of the way, before I can activate a new gprs plan or will they be switched automatically if I subscribe to a new plan?

You can activate the mega no limit from the 155.it, no problems for that.
I don't understand your second question. If you don't have one of the 3 GPRS bundles active you simply pay per use. You can see on 155.it if you already have some active options, but I suppose you already know it.

Perhaps this page can help:

http://www.orange.nl/orange/waarom/wereldw...tariefsmart.php

You can select the countries to roam in from a drop-down menu.