For example, one roll of Ilford FP4+ 120 costs € 4.28 (and € 3.00 if you buy 10 or more). At Photografica (in Denmark)
one roll costs € 6.12. So, if you order enough even the shipping costs of €10 can be affordable.
I also see that VAT in Denmark is 25% and in Germany 19%, so that is a plus.
In short, decide what you're gonna buy, check prices + shipping costs on internet and go for the cheapest supplier, or - also important - support your local photo store.