B1G1 = Buy one get one free. Also BOGO. ESC = Easy Saver Coupon. Found in the Walgreens Easy Saver rebate books in store. ESR = Easy Saver Rebate. Item that has a rebate offered in the monthly Walgreens Easy Saver book available in store. FAR = Free After Rebate. MFR = Manufacturer. MIR = Mail in Rebate. MM= Money Maker, the store will pay you to take home this item! RP = Red Plum. One of the coupon inserts in your Sunday paper. RR = Register Reward, earned at Walgreens and can be used on a future purchase. SS = SmartSource. Another coupon insert that can be found in your Sunday paper. V = Valassis. Yet another coupon insert you may find in your Sunday paper. WYB = When You Buy. As in the item is free when you buy XYZ.