Ichinobo
Aoba-ku
Bath for ¥1,700
300m from Iwamatsu, down a slope and over a small bridge.
This is a very nice hotel and has both indoor and outdoor baths, though the outdoor bath is rather small. Free bus to/from Sakunami station running hourly.
Iwamatsu
Sakunami Onsen
A big outdoor area with a few baths next to a river. Great just after winter when the snow from the mountains is melting and the river is rushing by. Onsen for overnight guests only.