Save big on Allegra Children’s allergy medicine at Target with a high-value double coupon stack! Each four-ounce bottle sells for $10.89. Add a 20% off Cartwheel offer to the Cartwheel app on your smartphone, and scan it at checkout. Also, use a $5.00 coupon from the 3/12 Red Plum newspaper insert. Pay just $3.71–save 66%.