Ester-C Vitamin C supplements are on sale this month at Walgreens, buy one get one free! The Walgreens coupon policy doesn’t allow a coupon to be redeemed on a free item. Use one Red Plum coupon. Earn Balance Rewards Points with the Health & Wellness coupon on the last page of the weekly Walgreens ad. Get Ester-C Gummies for $3.77–that’s over 60% off!