Nintendo is now offering the Switch Dock as a separate purchase for the first time. The Dock is an Authentic Nintendo product, albeit refurbished, so there is no chance of it bricking your Switch as is the risk with many third-party alternatives.
https://www.notebookcheck.net/You-can-now-buy-an-official-Nintendo-Switch-Dock-for-just-US-39-99.428678.0.html