This is a customized version of a recently popular SFF / MFF case called the SAMA IM01 (amongst other names that vary based on region). It's typically available on NewEgg in it's base form for around $60, and usually has a mesh side panel instead of tempered glass, though apparently tempered glass is coming. It's a very good case that is essentially an NR200 clone but with the ability to fit MATX motherboards, and a bit more room for GPUs and PSUs.
It’s basically a SAMA IM01 with a glass side panel. The SAMA IM01 however has the option to mount the GPU sideways, but lacked a clear panel to show it off. The Nitro M01 has the clear panel, but removed the ability to mount the GPU on the side… (｢•-•)｢ ʷʱʸ?