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Amazon [amazon.com] has the 21-Pack 1.3-Oz Gatorade Endurance Energy Gel (Mango) on sale for $ 11.51 when you check out with Subscribe & Save. Shipping is free with Prime or $ 25+ orders.
21-Pack 1.3-Oz Gatorade Endurance Energy Gel (Mango) $11.50 w/ S&S + Free S&H w/ Prime or $25+