In reply to ripper:
This summer prices were €55 half board or €45 with Alpine Club membership.
It's 700m haul up to the start of the routes.
There's a 9-berth bivvi hut just below the col; free, but water is variable.
You can also get to Rif. Contrin and then walk across to the col - slightly longer but less brutal and similar costs. I think you can get a jeep taxi to the hut (the road is forbidden for private/hire cars).
A lot depends on your plans after the summit. If you come down the W ridge via ferrata then leaving gear at the bivvi hut is fine.
Finally, there's a hut on the summit, if you don't fancy extending the day to get down and want to enjoy a night on the summit.
The guardians of both are extremely helpful if you contact them through their web pages.