When Marco and I dropped my family off at Schiphol airport, we stopped at a shop next to the Starbucks. This shop is known for having a small selection of imported American items, including candy, barbecue sauce, and other less than healthy snacks. Imagine my surprise when I found a 15 euro box of twinkies:
Granted, it is a box of 10 twinkies but that still works out to €1.50 per twinkie, or $2. I have also found similar price increases for pop-tarts (English | Dutch) which I have fond memories of being able to get 2 for $5 in America. Here it is €5.50 for one box, although we recently found a €4.50 deal at an Asian supermarket of all places.
The only import place I have visited in The Hague is Kelly’s expat shop which had some interesting stuff with about the prices you expect. Unfortunately sometimes it is easier and cheaper to shop on Amazon UK and have it delivered to the Netherlands. But it’s more fun to go to the stores directly.