Bidding is the formal and competitive procurement procedure through which offers for construction are requested, received, and evaluated. Find existing contracting opportunities you can bid on and view all upcoming contracting opportunities for vendors who want to work with the state.Find RFP searches and finds website design bids, contracts, and request for proposals. Economy of Preparation. The City of Mill Creek is seeking proposals from an experienced website design firm to redesign, develop and implement a new design for the City's website. To submit a bid or proposal, follow the instructions outlined in the solicitation. All City Capital Improvement Projects are posted on the Builders Exchange of Washington. Please view this website for bid documents, project details, and plans. Below is the complete list of local government RFPs, RFQs, invitations to bid, and other bidding documents in our Sample Document Library.