OCLC documentation can be ordered online at OCLC's home page. One copy of each relevant manual is available free (e.g., libraries with at least one ILL authorization can receive the ILL User Guide free). Additional copies are billed to your FEDLINK account. Most manuals cost $20 or less.
Click here for a list of documents with prices.
For a lists of no charge documents and the order form for all documentation orders: http://www.oclc.org/oclc/menu/doc.htm