It is expensive
Eric Methven had a contact who brings it in from India by the bolt. The lady sews bespoke tents, canopies, and gazebos, etc., and even she couldn't get the price down by much.
If they don't comment on the thread, Eric, Ian (bilmo-p5) are the ones I know of who might know a good supplier.
Loads of other folks asking and using the stuff too though.
cheers,
M