well you know me and pretties. I always at least try to keep an eye on stuff. I have heard that even though Istok lists as silks some of the fabric is a poly silk blend or not even silk at all.
http://www.manhattanfabrics.com/catalogue.cgi?ddisplay=1779
http://www.leandrofabrics.com/newarrivals.html
http://www.iluvfabrix.com/upholstery-fabric/damaskfabric/7-2.htm
http://www.decorativesilk.com/Scripts/default.asp
http://www.luigi-bevilacqua.com/
http://www.e-luxus-fabrics.com/soie_us/index.htm
http://store.schindlersfabrics.com/glsiupwefa.html