Navy bean seed source

Hi, anyone know a supplier of Navy Bean seeds aka Northern, Haricot (not Haricot Vert). I thought It'd be a bit of fun growing my own baked beans for canning. I'd probably need to yield about 2-3kg of dried beans per year for our supply. We already grow onions and tomato varieties and make gallons of passata. We have great success with other bean varieties, particularly soy, but can't find any Navy seed sources in NZ.