Are you talking about blank double layer DVDs? For a single disc I suppose that is kinda pricey considering a single single layered DVD probably only costs about 75p (not sure wot that's in Euros). But funnily enough, I'm not surprised they've got a such a glitsy price tag coz of the protection dual layer DVDs are meant to give (against scratches and ensuring data isn't damaged).
In short, yeah I reckon it was a bit expensive but trust me, they're not that much cheaper here either.