Welcome to the Nassau County Formal Solicitation Board. Welcome to the Online Vendor Bid Site for suppliers and bidders interested in bidding opportunities for the commodities services and technology contracts.The Nassau County Bid Solicitation Boards are open to all registered vendors. Vendors that have not registered are able to view open solicitation opportunities. Before you start to fill out the bid form, read the bid carefully. Each. BID shall consist of one (1) original and three (3) copies of the RFP Package which shall include all required documents and any supplemental information.