Try Home Depot or something along those lines - they make custom shades but don't usually charge as much as a decorator would. Try JoAnn Fabrics or whatever fabric store is in your area - they have hardware for making shades. If they don't have it on...
*love* the woven wood shades. They come in so many colors & textures now, and you can get them with banding on the edges for a finished look. And they're very popular at the moment. You can also get them with a liner for added privacy, insulation and...
I don't know if you can switch them out without seeing the chandelier however, the shades that are sold for these pieces have clamps that are meant to fit on the bulbs.