try hiawatha hobbies.com they are very close distance to walthers headquarters in milwaukee.
They have a large inventory of ho scale structures. They still have alot of the out of stock/production walthers kits, i was able to find my paper mill industry here, they have alot of kits that are hard to find, this place is truely a jem. They have a online website but when i visited their store i found lots of structures not even listed so i would call them and ask, very nice people