Amazon has Tylenol PM Extra Strength Pain Reliever and Sleep Aid Caplets on sale for $3.99 (usually $7.99).
To get an even lower price, clip the coupon for 25% off. Then check out with Subscribe & Save for 5% or 15% off. If you subscribe to five items or more and have them shipped to the same address, you'll get the maximum 15% discount. You could pay as little as $2.39 for one bottle of Tylenol pain reliever caplets.
If you love to score cheap deals, browse these Amazon deals under $5 and take a look at more Subscribe & Save deals.