Allegra products are on sale for $18.99 at Rite Aid. Buy one 24-count Allegra Allergy or 30-count Allegra Allergy 24 Hour. Stack a $5.00/1 Facebook coupon with a $3.00/1 Rite Aid store coupon. Remember, one store coupon can be stacked with one manufacturer coupon on a single item at Rite Aid. Later, submit for a $5.00 MobiSave credit, making the final price $5.99!