Walk-In Clinic. 217-540-6123. fax: 217-347-7197. Hours: 10 am to 8 pm - Monday through Friday. Effingham Walk-In Clinic Pfizer Vaccines. Beginning Thursday, September 9, the SBL Effingham Walk-In Clinic will offer Pfizer vaccines to anyone age 12 and older by appointment only. Vaccine appointments are available on Thursdays from 1 to 7 p.m..