hm... it will cost more because of extra transportation unless you ask the Bloodsworn to transport it on the rest of the journey to you, which is then become the same price as the spices sold to the Bloodsworn.
Although, I remember saying "The ill will be quarantined, transferred into camps with the only jobs available is cutting wood, mining, and other things that doesn't require making edible stuff. 2 hours ago" :/
The Bloodsworn allow for such a place to be built in their borders. But it is heavily watched and guarded. Any signs of sickness will be seen as an act of hostility.