R
Do a Google search for apotheek + name of the city, if they have a website or anything it'll show up. The ones I went to all had websites. They will probably don't have a specific online ordering page so you'll have to use their contact page to order something. It's usually some automated form. Oh and if you're going, make sure you bring one of the large shopping bags as you probably don't want to walk 2km with a semi transparent bag you got at the pharmacy =p