How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.Below are links to solicitations available through Maricopa County. Development Services provides the City Council and community with creative guidance and effective implementation of land use development. The bid or Request for Proposal will be designed to be competitively bid following all MCCCD Purchasing guidelines and allowing maximum competition. Welcome to the City of Maricopa, AZ, Bid Postings.