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Amazon [amazon.com] has 4-Pack O-Cedar EasyWring Spin Mop Microfiber Refills for $ 19.97 – 10% when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $ 16.97.
Shipping is free with Prime or on $ 25+ orders.

Price:
$ 22.99 lower (58% savings) than the list price of $ 39.96
10% coupon applied at checkout. Subscribe & Save orders only.