Amazon has the 400-count Amazon Basic Care Allergy Relief Antihistamine Tablets (Diphenhydramine HCl 25 mg) on sale for $7.67 - 10% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $6.52 with free shipping on $35+ or with Prime. Same active ingredient as Benadryl Allergy ($15 for 100 tablets).