ICF Plank stack chair, with Natural Ash plywood body and chrome legs. Price: $145 / (57) Available ICF Plank Stack (Natural Ash) If you have office furniture needs, Office Furniture Center is a nationwide provider of cost-effective workstations, desks, credenzas, seating, filing, reception and conference furniture. Our entire inventory of affordable office furniture is located in Chicago; to browse our selection, please visit officefurniturecenter.com.