https://www.amazon.com/dp/B019GU4IL...11f1a3ae8e6bb4780fc40INT&m=ATVPDKIKX0DER&th=1 s 40-Count (4 Tubes) Nuun Sport Electrolyte Tablets (Mixed Flavors) on sale for $15.60 - 5% with Subscribe & Save = $14.82. Shipping is free w/ Prime or on $35+ orders.