BIDDERS, PLEASE NOTE: The GPO 910 "BID" Form is no longer required. For information on the bidding process, please contact the City of Dallas Procurement Services at: (214) 670-3326.City of Dallas, TX , TX is looking to buy goods and services. Discover all bid opportunities, RFPs, and government contracts with City of Dallas, TX. A local firm whose bid is within the following percentages may be considered for award over the lowest bidder (City Council ultimately decides):. If you are looking to work with DHA and are responding to an Invitation to Bid, Request for Proposal, or Request for Qualifications, you're in the right place.