Where to get Cherry Rootstock
I did some checking and didn't find any nurseries in the Benton County that carried cherry rootstock.
Carlston and Treco Nursery in Oregon carry rootstock but you have to buy 25-50 in quantity.
OneGreenWorld, put near Portland carries rootstock.
Or duartenursery - California
Fowlernurseries.com - California
Do a computer search of cherry rootstock nursers in Oregon.