The price for a cheap prepaid is around 70 Euro plus or minus a few dollars depending on carrier type of phone etc.
$100CAD is probably a good price if you can get one there before you go.
Here are some sites, sorry they are in Dutch you can copy the links into Google translator or something.
As I mentioned if you have an unlocked sim phone you can just buy the sim card and slot it in with some minutes for about 20euro.