I recently bought this Surface Book UAG Cover and it fits

UAG Scout Series Rugged Surface Pro 9 Scout Series w/ Handstrap - Bulk Poly Bag- Black

Urban Armor Gear Metropolis Black Microsoft Surface Pro 9 Case

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UAG Designed for Microsoft Surface Pro 9 Scout Black, Lightweight Slim Rugged Protective Cover with Pen Holder, Built-in Hand Strap by URBAN ARMOR GEAR

Hands On with UAG Rugged Case for Surface Computers

Plasma Series sports a visually striking translucent design. Featuring a featherlight impact resistant construction, secure closure, and non slip tactile grip. Perfect lightweight protection for active individuals. Surface Pen storage. Cooling vents at bottom for uncompromised air flow. Metal & Alcantara Keyboard compatible.

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UAG Plasma Series Microsoft Surface Laptop 5/4/3 13.5 Case (333253114343)

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UAG Designed for Microsoft Surface Laptop 5 / Laptop 4 / Laptop 3 13.5 Case Plasma Feather-Light Translucent Rugged Military Drop Tested Laptop Cover, Ice by URBAN ARMOR GEAR