i saw these at an expo awhile back.
a breeder/vendor from another table came over and bought this feisty female.
they were from an Idaho based breeder - Molecular Reptile. here: http://www.molecularreptile.com/Both_Leio.html#black i recall that they breed small batches. anyway they could probably help u out.
i think the breeder that bought the female was one of the staffers from Inland Reptiles from Spokane, WA. Nick Mutton and Inland Reptiles specializes in Carpets (pure lineage) and other arboreal snakes.
Edit: also here are two forumers and their pix thread for their WLP's. they haven't been very active tho. WLP's are beautiful!
https://ball-pythons.net/forums/showthread.php?217691-Northern-White-Lipped-Python-Picture-HEAVY!!!-CHUNKY!!
https://ball-pythons.net/forums/show...-Python-photos