Lampshades

Found this website http://www.thecabinshop.com/117-aged_leather_lamp_shades.html. Love the different type of shades. I have real old lamps from my great grandparents that I want to keep but just update the shades. Why are lamp shades and accent pillows so expensive? I did however find some great pillows on sale up in TN for 11bucks a piece. That is a big bargain for what is out there!