Amazon.com has for Prime Members: 52-Count Swiffer Sweeper Dry Sweeping Pad Multi Surface Refills for Dusters Floor Mop, (Unscented) on sale for $6 after clipping $4 off coupon and checkout via Subscribe & Save (15%). Shipping is free.
Comes out to about $0.12 a refill.
https://www.amazon.com/gp/product/B07622VSV3
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