Where to buy it? HERE:
RG35XX+ and RG35XX H Official Cases
If when you bought the console, you did not ask for it with a cover, or if you have lost it, or for any other reason, you need one, you can get yours from here, from the official website of
ANBERNIC portable protective bag For RG35XX/RG35XX Plus
For the Horizontal version, RG35XX H exists other: