The City of San Diego provides you with direct access to bidding and contracting opportunities on all its construction projects. Learn how the County buys products and services.Search contracts, find open solicitations on BuyNet. Public Works Contracting. Register with BuyNet today and begin receiving notice of business opportunities from the County of San Diego. We welcome all licensed contractors who are interested in submitting their company details for inclusion on the District's Informal Bidding Contractors List. Register online to view bid opportunities, download documents and bid on projects. Vendor Qualification Packet. The form can be filled-out electronically, printed, signed, and faxed to Procurement at 619-400-2541 or scanned and emailed to the appropriate Authority staff. Bidders are required to complete the entire.