The County deals primarily with manufacturers and wholesalers and strives to purchase at highly competitive prices. The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as.Certify and date this form in the designated fields. Note: This form will not be accepted without a stated goal, certification or date. The Purchasing Department is responsible for overseeing bids, requests for proposals and vendor contracts. Subrogation clause in favor of Nassau County Board of County Commissioners.