GAC facilitates the procurement of goods and services in an open, fair, transparent, and competitive environment. View open procurement solicitations.Process to submit a proposal. Develop idea and determine eligibility. Solicitation search. Below you will find current bid proposals for Houston ISD. Click on the proposal name to get more information and to download relevant supporting documents. Houston First Corporation requests bids and proposals regularly for a variety of services and improvements across our portfolio of properties. Looking to do business with METRO? View business opportunity programs, along with current and anticipated procurement opportunities in the coming months.