We use couveture from Marou.

Marou is a Vietnam based chocolate company that specializes in bean-to-bar production. They are ethical, their supply chain is transparent - I mean, crystal clear - and their product is superb.

Read about them here:

http://marouchocolate.com/post/55952141446/press

Check out their stuff here:

http://marouchocolate.com/post/58397164815/products

We use their Vietnam Couveture 65%.