If you are staying or living in Udon Thani and you are in the mood for a good cup of real coffee then "Udon Delices" is the place to go. And actually not only for coffee but they also have a good collection of wine from all over the world, cheese from French or tasteful cold cut meat from Spain and Italia. Wishing they had a shop in Khon Kaen!
They sell for take-home and wholesale, although they also run a coffee-shop in the shop. Next door is the coffee wholesale shop selling "100% Original Thai Coffee". They are located along the eastern side of the ring road of Udon Thani and are open every day. There is Thai staff but if you want more information just ask for Mr. Alain.