I source my linen from recovering communist states in the remnants of the Soviet Union.
Linen is my preferred material for bedding and towels (except for travel towels, where I still prefer synthetic). When purchased through normal channels, it can be prohibitively expensive. I cut out the middlemen and acquire linen directly from Eastern European makers on Esty, where it is much more affordable. My duvet cover is from Belarus. My sheets and pillow cases also hail from Belarus. My preferred towels are from Lithuania.