The Rockchip RK3399-powered ASUS Chromebook Flip C101PA-DB02 convertible has a metallic body, it features a 10.1-inch touchscreen display, and can be acquired for less than US$300.
https://www.notebookcheck.net/Asus-Chromebook-Flip-C101-is-now-available-in-the-US.251034.0.html