The Steam Machine is here, but getting one is a little complicated. Valve is taking preorders using a reservation system, which is intended to make the process more fair and harder for bots to exploit. However, it's a bit different than the $5 reservations Valve used for the Steam Deck.
Source: [The Verge](https://www.theverge.com/games/952191/valve-steam-machine-reservation-preorder-process)