The main parking places in Grächen are shown here. Prices range from CHF 5 to 7 per day for outside parking. For indoor parking, around 10-15 CHF per day.
Open this map on your phone with the link below. Save a KML file for maps.me offline maps: Parkplätze Grächen
https://drive.google.com/open?id=1IpoJprspDMa7twsVrug4fIrQkKIi7SzM&usp=sharing