Here, you'll find details about contracting opportunities, vendor qualifications, proposals and how to bid on projects. How do I submit a bid or proposal?All formal bids and proposals shall be submitted as specified in the solicitation document. To register to receive notifications about solicitations relevant to your business please visit in our e-procurement system, APP and register. Complete Contact information. • Awarded to lowest bidder. This tab discusses many of the steps you are likely to take while bidding as a subcontractor on ADOT projects. Through our commercial bid request we can offer the most affordable and unique interior and exterior painting services in the Phoenix and Tucson areas. Start with the documents contained in the property documents link available on our website. Visit the contractor's profile and click 'Invite to Bid.