To participate in the RFQ process, you must be fully registered with iSupplier. Here is information on Selling to the City of Oakland.Bids in construction are typically submitted in hard copy. Bids must estimate both costs and the time required to complete services. All businesses that want to contract with the City must register with iSupplier, to receive bid notifications, to apply for local business certification. A. When Advertising Required. 6.1 Bidding Documents Checklist. 31. 6.2.