There are a few I know of. Mac's Discus in Woodinville is one but he has a minimum purchase and I'm not sure if he imports some of his fish or breeds them all. Also, Natural Systems Aquarium Maintenece run by Mark G. also has a discus and angelfish hatchery. I'm not sure to what level he is breeding right now but he's a great guy and I've seen his hatchery and fish before...they are really nice. You should be able to find him in the phone book. If not PM me and I'll get clearance to give out his cell number.
He works for Clayton Aquariums, but breeds discus in his garage. I don't have his current phone #(he moved), but if you call up Clayton Aquariums they can get you in touch with him.
The Fish Store, King's Discus, or African Northwest also can get you in touch with him.