I have an ceiling lighting fixture that has a square glass shade that I broke last night. It is just a square piece of glass with a hole in the middle that is attached to the fixture via a screw that goes through the whole and then a cap that is put on the screw to hold the glass in place. Does anyone know if they sell these shades at a Loews, Home Depot or Target type store? I found one on amazon, but they're charging over $8 in shipping for a $3 item. Please help! Thanks!