Ridiculously overpriced DVD

I'm a big fan of this series and have season 1 on DVD (for which I paid £5.99 about 8 years ago). But . . . . . how on earth can the box set which includes season 2 be selling for so much???? (nearly £40) I don't really advocate video piracy but the sort of greed that's behind pricing like this certainly makes me wonder whether I should be downloading a copy of bit torrent. All I want to do is buy season 2 for a reasonable price, and £40 isn't reasonable by any stretch of the imagination.