London and Paris both have resale shops which sometimes have scarves. Quaility varies enormounsly. Check things like the "Time Out" shopping directories for each city, or do an online search for newspaper articles / reviews.
Very helpful seller. Excellent selection of scarves, very accurate descriptions, and lots of education to boot. Quick to direct you to another seller, like greenjade, designer silk scarves, and luxury-scarves, when she knows they have something that might suit you.