We've created a seller's guide to help you easily navigate these negotiations. We'll cover everything from preparing your pitch to sealing the deal.You must send all notices and other communications relating to Amazon to the notices address set forth in the Agreement. Go to "Vendor Central > Settings > Warehouse Settings" and create a warehouse. The reality of winning a State of Illinois contract sets in when the work is complete and your business must wait for the cash to come in from the State. Up. CoOp. Agreement. With regard to collecting and using student data, vendors must agree and sign contracts to adhere to the CPS SOPPA policies and Illinois law. Search Sourcewell's competitively solicited contracts and awarded vendors. A complete index of current Ship To codes is available in the Ship to Codes.