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Amazon [amazon.com] has Arm & Hammer Clean & simple liquid laundry detergent on sale now.
Size:
43.75 Fl Oz [amazon.com], 2 for $ 6.99
122.5 Fl Oz [amazon.com], 2 for $ 7.66
Add a quantity of 2 to the cart, the multibuy discount will be applied during checkout.
Shipping is free w/ Prime or on $ 25+ orders.