To register as a vendor and view current bids, please visit the Purchasing Services webpage. Bids must be opened publicly at the time and place stated in the Invitation for Bid. 4.At least two or more responsible bids must be received. Vendors can view bids and submit their offers and proposals electronically using this System. Com or call (800) 990-9339. CCTA uses PlanetBids for the procurement process. Visit PlanetBids to sign up, download the RFP and other documents, and submit proposals. The Fee Proposal (ATTACHMENT F) shall be filled out, executed, and submitted in accordance with the instructions in the invitation.