Amazon offers the CytoSport Cytomax Sport Energy Drink 4.5-lb. Jar for $22.35. Add it to cart via Subscribe & Save and it drops to $21.23. With free shipping, that's the lowest total price we could find by $6. It purports to reduce cramping and post-workout soreness.

Be sure to cancel Subscribe & Save after your order arrives to avoid being billed for subsequent shipments.