I had the same concern when I was looking for a scanner for my garage. There are many sites offering clones, especially on big marketplaces. I suggest avoiding any seller who can't provide warranty or official support. Also, look out for sites that actually specialize in diagnostic equipment rather than general electronics.

When I was searching for mine, I ended up buying from ECUTools https://ecutools.eu/ They only sell original diagnostic devices and are official partners of several brands. Their website is focused entirely on automotive diagnostics, and they even offer professional support. Everything I ordered arrived with full documentation.