Amazon has the 150-count Extra Strength Tylenol PM Caplets (500 mg Acetaminophen & 25 mg Diphenhydramine HCl) on sale for $9.44 - 20% off coupon (check "Save an extra" box, eligible on first S&S order for this product)  - 5% off with Subscribe & Save (can cancel at any time) = $7.08 with free shipping on $25+ or with Prime. Less than 5 cents per pill.