Now is the time to get a Flu shot! Katie Holstein, Regional Pharmacy Supervisor of Discount Drug Mart, says the season has already begun as early as Oct 1st all the way through the end of May. No Appointment Needed - Walk Right In! Fill out an administration form and we will take care of the billing. Most insurance companies cover the flu shot. Several vaccines available including high dose for ages 65+ and Flublok (egg-free). Available for ages 7+.