Maybe 1k for the index and 2k for a reasonably high-end desktop, so 3k or 10x the price of a quest. Obviously that's not really a fair comparison for various reasons, though.
I don’t know if Valve will be able to get down in price. For instance their Steam Deck which is in the 400+$ range for a handheld, when Nintendo went with lower specs but also lower price. Valve doesn’t seem that interested in that strategy.