Ruger No.1s have always been expensive. In 1978, their model 77 bolt gun was $230, the No.1 was $295!
Ruger doesn't make everything all the time. What they list is what they are building now, or have on hand. Next year, could be something different. The year after, they might make this's years models/calibers again.
So, if you don't see what you want listed, it may mean they have dropped it, or that they just aren't making that particular thing now, and might resume making them at some future date.
Seasonal production, I think they call it.