From Amazon
STM Goods Dux Shell Case for Microsoft Surface Pro 4/5/6/7, Black
OnBuy
STM Dux Shell 38.1 cm (15") Cover Black
Conrad Electronic
STM Goods Dux Shell Tablet PC cover Microsoft Surface Pro 4, Surface Pro 5, Surface Pro 6, Surface Pro 7 31,2 cm (12,3) Back cover Black (transparent)