[Wanted] Duvet - King XL (Superking) 300 or more thread count

[Leetpro]

Im looking for king XL (Superking) linen, must be 300+ tread count.
The best price I could find was @home - R699 for the duvet cover set (400 thread count Egyptian cotton). They only have 2 sets - Brown and Grey (bought them both)
Looking for something else...

any advice would be appreciated