Susan Deliss ships a lot to the USA, with orders of stock items, including fabrics, generally only taking a few days to arrive. It's quicker and much simpler than you might think! You can order sample memos and place orders for fabrics and other products displayed directly through Susan's website. Susan makes lots of lampshades bespoke with US finial fittings so enquire if you are interested.
Do make an appointment to visit Susan's Notting Hill studio if you come to London.