I'm in the process of setting up a darkroom in a friends garage. There is too much light coming in through the door jams around the garage door as well as the door that one walks through from outside. I want to tack up some blackout cloth but need a direction to start from. I looked for some several years back a regular cloth/sewing shop but they did not have any. Being in LA there might be some at some film production supply stores, but I'm thinking I might find some cheaper at one of the wholesale fabric shops in downtown. This area, known as the garment district is several square blocks of one fabric store after another. Does anyone know offhand the name of one of these shops that carries such an item? Thanks for replies.