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Amazon has 12 pack – hth Pool Shock Super Shock Treatment 4-in-1, for $ 25.38 after clipping the 15% off coupon. Shipping is free for Prime members.
For comparison, $ 29.86 at Walmart.
12 pack – hth Pool Shock Super Shock Treatment 4-in-1, $25.38 after coupon at Amazon, free shipping for Prime