3 years since I walked it but I stayed in:
The youth hostels in Lausanne and Montreux - can't remember the price but cheap by Swiss standards (about 25CHF plus meals?) and with a reduced rate dinner for pilgrims
The abbey guest house in St Maurice - a single room, dinner and breakfast for 45CHF I think
One free night in a rubbish bin shed in a forest (I got lost in a downpour
)
The parish albergue in Orsieres which was donativo
The Hospice Grand Saint Bernard - about 40CHF for dinner, bed and breakfast
Those prices are likely to have changed in the meantime.