From as low as CHF8 a bed a day, targeted at groups:

URL

I have not used them but the German site:

http://www.gruppenhaus.de/

Depending on the group you might also be able to find something on here http://www.pfadiheime.ch/ (Pfadi = scouts). They have many houses all over Switzerland (also close to ski resorts like Elm, Schwanden, Matt etc.) but you will have to cater for yourself.

Hope that helps.

Not sure if the Youth Hostels in Switzerland have been mentioned before.

There are some interesting offers for groups and families too. Website's only in German, though.