Unfriendly greeting

As I've got 2 birthdays coming up over the next few days- my dad's on Monday and my sister's on Tuesday (which is also my birthday- work it out ;-) ) I've had to of course buy birthday cards for them. And I can't beleive the price of the things- £2, 3 or 4 for what really is just a piece of printed card which I can't imagine costs more than a few pence to make. And this is just in Asda, places like Clinton's are even more expensive. The greeting card business must be one of the most profitable lines of business out there!