Was this page helpful? To participate in the RFQ process, you must be fully registered with iSupplier.Here is information on Selling to the City of Oakland. When a Contract (or Purchase Order) is awarded, the Bidder will be required to fill out the following forms included in the Bid packet:. Bidders must agree to execute the contract as written. When a contract is awarded, the Respondent will be required to fill out the attached Employer Self. The Oakland Housing Authority ("the Authority") invites proposals for Mailing Services. Vendors are required to return a signed copy of the "Execution of Offer" form and submit their pricing on the attached bid form. An original proposal and three (3) copies shall be submitted. Documents must be in a clear legible 12-point font and 8.5x11 inch format.