sanus and studiotech are two companies that come to mind. these might fit your bill:
http://www.sanus.com/en/products/ProductDetails/line/avFoundations/pcat/component/modelCode/CFA21/
http://www.studiotech.com/products/component_cabinets/ultra_u-22s_cab/index.html
http://www.sanus.com/en/products/ProductDetails/line/avFoundations/pcat/component/modelCode/CFA21/
http://www.studiotech.com/products/component_cabinets/ultra_u-22s_cab/index.html