I see the Steam machine to start at 700$, more for higher tier with more SSD storage.

Steam controler would be hard to sell above 80$ but I would not be surprise up to 90$, 100$ would be deal breaker and psycologocally bad for marketing.

Steam Frame I'm very puzzled. Meta Quest 3 is 500$ and above, if Valve don't rely on stealing and selling all our data like Meta but still hope on the 30% cut for extra sofrware sold, I guess 600 to 700$ would be fair and still chance of success. I'm expecting up to 800$ for the 1TB version but more might be hard to swallow.