View Public Works' open solicitations, and learn more about how to register as a supplier and submit a bid or proposal. Vendors and suppliers interested in doing business with Allegheny County can review open solicitations for Purchasing and Supplies bids on the Bonfire website.Construction contractors interested in performing construction contracts with the department must first complete the Vendor Registration process. This Request for Proposals (RFP) is published to obtain competitive prices for a. A complete Invitation for Bids (IFB) consists of the following documents: THE PROJECT MANUAL, dated.