MONROE - The Green County Health Department is offering walk-in flu clinics during September, October and November. The hours are Mondays through Fridays from noon to 1 p.m., with additional hours on Tuesdays from 1 to 3 p.m. and Fridays from 9 to 11 a.m. at the health department, N3150 Wisconsin 81, Monroe. The flu vaccine costs $35.