Amazon has the 90-Count Amazon Basic Care Naproxen Sodium Tablets for Back and Muscle Pain (220 mg) on sale for $3.49 - 5% off with Subscribe & Save (can cancel at any time) = $3.32 with free shipping on $25+ or with Prime (extra 15% off with 5+ items S&S order).

Well-reviewed pain reliever and fever reduction for up to 12 hours.