To register as a vendor and view current bids, please visit the Purchasing Services webpage. The following is a listing of various bid postings.Click on any of the titles for the details on that particular bid. Below you will find all of our current open RFI, RFP, and RFQ bids as well as instructional videos for the budget templates. CCTA uses PlanetBids for the procurement process. Visit PlanetBids to sign up, download the RFP and other documents, and submit proposals. First 5 Contra Costa will accept applications until the December 2, 2024, deadline. Request for proposals. Submit your signed bid in a sealed envelope addressed to the Purchasing Department, 500 Court Street, Martinez,.