For GM factory service manual used in dealerships, best places to look are ebay or auto swap meet, though they don't surface too much, also put a post on this board in the parts wanted section. It only comes in one form and that is a two volumn ( each the size of a very large phonebook) that covers all the Buicks for 1985, and the info is all mixed into the two, so you have to get both. Price could vary $50 for a beat up used one to $150 for a never used one, again the price can vary, good luck.