Not uncommon to find available to buy just uncommon that they are actually bought/installed. The retrofit options are vastly cheaper and mean you don't have to replace a functioning toilet.
They also make stand alone bidets which would sit next to a toilet, but they're even less common due to space constraints.

They decided to not make it a phev after doing some testing a few years back. Otherwise I'd already own one. Especially since they have AWD on the hybrid now.