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. The bid or Request for Proposal will be designed to be competitively bid following all MCCCD Purchasing guidelines and allowing maximum competition. Development Services provides the City Council and community with creative guidance and effective implementation of land use development. Welcome to the City of Maricopa, AZ, Bid Postings. Maricopa County open and closed solicitations are posted here. Find exclusive open government bids opportunities and RFPs. The bidder must be registered and provide proof of registration in the federal System for Award Management (SAM) registry at the time of bid submittal. All Proposals must be submitted electronically to BidSync.