Public Baths in Fukuoka City

I found public bath facilities, Sen-toe in Japanese pronunciation, one in the cenral Fukuoka City (upper photo) and one more near my University (the lower). (One of the two doors is for men, and another is for women.) They charge about 400JPY (~$4) a time, which I feel bit expensive. When I was a student here, we had several public bath places even only around the University, but now only a few survived. After taking bath, it is very relaxing and refreshing to drink a small bottle of milk or coffee-flavored milk. Now I have few chance to use public bath in the city, but sometimes enjoy public hot spring bath in particular places near the city.