Just came across this website on my travels online looking for reasonably priced silk linings.
https://www.sarojfabrics.com/Dye-40-gms-Pure-Habotai-Silk-FabricThe prices seem to be good to be true, and they'll dye as little as 1 metre for you. They've got Dupion, Velvet, Crepe, Georgette, and other non silk fabrics you can get dyed. Obviously they are catering for the indian market mostly as they have beautiful sari fabrics.
I'd like to order a length to see what the quality is like, but shipping is pricey to Australia. It would work out cheaper than buying locally if I bought several pieces, but I'm wary of doing so unless I know what the quality is like!