All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: Sealed/Submitted Competitive Proposals (RFPs) will be received by Region 5 Education Service Center (hereafter call the center) for Building Materials & Supplies (Supplemental); The school districts/other entities participating in this cooperative bid are: Alamo Colleges, Alamo Heights, Aledo, Aldine, Alief, Allen, Alvin, Anahuac, Angleton, Apple Springs, Barbers Hill, Bay City, Beaumont, Bellville, Big Sand, Big Spring, Bob Hope School, Brazosport, Brenham, Bridge City, Brookeland, Bryan, Buna, Burkeville, Canutillo, Centerville, Central Heights, Chambers County, Channelview, Chester, City of Navasota, City of Pinehurst, City of Port Arthur, City of Vidor, Clear Creek, Cleveland, Clint, Coldspring-Oakhurst, College of the Mainland, Colmesneil, Columbia-Brazoria, Crosby, Dallas County Community College District., Dayton, Del Mar College, Devers, Deweyville, Dickinson, East Chambers, Ehrhart School, Evadale, Friendswood, Galena Park, Gause, Goodrich, Goose Creek, Grapevine-Colleyville, Green Dot Public Schools, Hamshire-Fannett, Hardin County, Hardin, Hardin-Jefferson, Hemphill, High Island, Houston, Huffman, Hull-Daisetta, Jasper, Jefferson County, Katy, Kemp, Kennedale, Kilgore, KIPP Texas Public Schools, Kirbyville, Kountze, LaPorte, Lamar Consolidated, Lamar Institute of Technology, Lamar State College Orange, Lamar State College Port Arthur, Lamar University, Laredo, Leander, Lee College, Liberty, Liberty Hill, Little Cypress-Mauriceville, Livingston, Lone Star College System, Lumberton, Magnolia, Marshall, Mercedes, Midland, Montgomery, Nacogdoches, Navasota, Nederland, New Caney, Newton, Onalaska, Orange County Drainage District, Orangefield, Pasadena, Pearland, Pearsall, Pharr San-Juan Alamo, Pineywoods Academy, Port Arthur, Port Arthur Housing Authority, Port Neches-Groves, Port of Port Arthur Navigation District, Region 5 ESC, Rio Grande City, Sabine Pass, Sam Houston State University, San Jacinto College, San Jacinto County, San Marcos, SETX Regional Planning Commission, Sheldon, Shepherd, Silsbee, Socorro, Somerset, Spindletop Center, Spring Branch, Spurger, Stafford, Tarkington, Temple, Texas City, Timpson, Trinity Valley Community College, Vidor, Warren, West Hardin, West Orange-Cove, Willis, Woodville, Yselta.