Amazon has the 16-Count Goody's Hangover Powders for Fast Pain Relief (Berry Citrus Flavor) for $5.86 - 5% off with Subscribe & Save (can cancel anytime) = $5.57 with free shipping on $25+ or with Prime.

Contains 1,000 mg Aspirin (NSAID) powder pain reliever with a 150 mg Caffeine boost for alertness.